particulate

• adj.

• 粒子性の、粒子の、粒状の、微粒子

関

fine grain、grain、granular、microparticle、microsphere、particle

　 　 　

WordNet

1. composed of distinct particles
2. a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant) (同)particulate_matter
3. paint (a surface) to make it look like stone or wood
4. dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn (同)caryopsis
5. a weight unit used for pearls or diamonds: 50 mg or 1/4 carat (同)metric grain
6. 1/60 dram; equals an avoirdupois grain or 64.799 milligrams
7. 1/7000 pound; equals a troy grain or 64.799 milligrams
8. a cereal grass; "wheat is a grain that is grown in Kansas"
9. the side of leather from which the hair has been removed
10. the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric; "saw the board across the grain"
11. the smallest possible unit of anything; "there was a grain of truth in what he said"; "he does not have a grain of sense"
12. foodstuff prepared from the starchy grains of cereal grasses (同)food grain, cereal
13. a relatively small granular particle of a substance; "a grain of sand"; "a grain of sugar"
14. a body having finite mass and internal structure but negligible dimensions (同)subatomic_particle
15. a function word that can be used in English to form phrasal verbs
16. not composed of distinct particles

PrepTutorEJDIC

1. 個々の微粒子の(から成る)
2. 〈C〉(穀類の)『粒』《+『of』+『名』》 / 〈U〉《集合的に》『穀物』,穀類 / 〈C〉(砂・塩などの)粒《+『of』+『名』》 / 〈C〉《おもに否定文で》『ごく少量』,ほんの少し(の…)《+『of』+『名』》 / 〈C〉グレーン(最小の重量単位で約0.0648グラム;《略》『gr.』,『g.』) / 〈U〉(木・石などの)きめ,はだ,木目(もくめ),石目
3. 小片,(ごく)少量,微量 / 粒子 / 不変化詞(冠詞・前置詞・接続詞・感嘆詞など語形変化のない語);小詞,小辞
4. 初老の,老境にかかった
5. (砂糖などが)粒の,粒状の / (紙・革などが)表面がざらざらしている

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/06/05 15:49:28」(JST)

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[Wiki en表示]

This article is about particles suspended in air. For general discussion of particulate types, see Particle#Distribution of particles.

This diagram shows the size distribution in micrometres of various types of atmospheric particulate matter. It also shows the different types of particulates in the atmosphere

Atmospheric particulate matter - also known as particulates or particulate matter (PM) - are tiny pieces of solid or liquid matter associated with the Earth's atmosphere. They are suspended in the atmosphere as atmospheric aerosol, a term which refers to the particulate/air mixture, as opposed to the particulate matter alone. However, it is common to use the term aerosol to refer to the particulate component alone. Sources of particulate matter can be man made or natural. They can adversely affect human health and also have impacts on climate and precipitation. Subtypes of atmospheric particle matter include suspended particulate matter (SPM), respirable suspended particle (RSP; particles with diameter of 10 micrometres or less), fine particles (diameter of 2.5 micrometres or less, "ultrafine particles," and soot.

Sources of atmospheric particulate matter

Some particulates occur naturally, originating from volcanoes, dust storms, forest and grassland fires, living vegetation, and sea spray. Human activities, such as the burning of fossil fuels in vehicles, power plants and various industrial processes also generate significant amounts of particulates. Coal combustion in developing countries is the primary method for heating homes and supplying energy. Because salt spray over the oceans is the overwhelmingly most common form of particulate in the atmosphere, anthropogenic aerosols—those made by human activities—currently account for about 10 percent of the total mass of aerosols in our atmosphere.

Composition

The composition of aerosols and particles depends on their source. Wind-blown mineral dust tends to be made of mineral oxides and other material blown from the Earth's crust; this particulate is light-absorbing. Sea salt is considered the second-largest contributor in the global aerosol budget, and consists mainly of sodium chloride originated from sea spray; other constituents of atmospheric sea salt reflect the composition of sea water, and thus include magnesium, sulfate, calcium, potassium, etc. In addition, sea spray aerosols may contain organic compounds, which influence their chemistry. Sea salt does not absorb light.^{[citation needed]}

Secondary particles derive from the oxidation of primary gases such as sulfur and nitrogen oxides into sulfuric acid (liquid) and nitric acid (gaseous). The precursors for these aerosols—i.e. the gases from which they originate—may have an anthropogenic origin (from fossil fuel or coal combustion) and a natural biogenic origin. In the presence of ammonia, secondary aerosols often take the form of ammonium salts; i.e. ammonium sulfate and ammonium nitrate (both can be dry or in aqueous solution); in the absence of ammonia, secondary compounds take an acidic form as sulfuric acid (liquid aerosol droplets) and nitric acid (atmospheric gas). Secondary sulfate and nitrate aerosols are strong light-scatterers. This is mainly because the presence of sulfate and nitrate causes the aerosols to increase to a size that scatters light effectively.

Organic matter (OM) can be either primary or secondary, the latter part deriving from the oxidation of VOCs; organic material in the atmosphere may either be biogenic or anthropogenic. Organic matter influences the atmospheric radiation field by both scattering and absorption. Another important aerosol type is elemental carbon (EC, also known as black carbon, BC): this aerosol type includes strongly light-absorbing material and is thought to yield large positive radiative forcing. Organic matter and elemental carbon together constitute the carbonaceous fraction of aerosols. Secondary organic aerosols, tiny "tar balls" resulting from combustion products of internal combustion engines, have been identified as a danger to health.

The chemical composition of the aerosol directly affects how it interacts with solar radiation. The chemical constituents within the aerosol change the overall refractive index. The refractive index will determine how much light is scattered and absorbed.

The composition of particulate matter that generally causes visual effects such as smog consists of sulphur dioxide, nitrogen oxides, carbon monoxide, mineral dust, organic matter, and elemental carbon also known as black carbon or soot. The particles are hydroscopic due to the presence of sulphur, and SO₂ is converted to sulphate when high humidity and low temperatures are present. This causes the reduced visibility and yellow color.

Deposition processes

Main article: Deposition (aerosol physics)

In general, the smaller and lighter a particle is, the longer it will stay in the air. Larger particles (greater than 10 micrometers in diameter) tend to settle to the ground by gravity in a matter of hours whereas the smallest particles (less than 1 micrometer) can stay in the atmosphere for weeks and are mostly removed by precipitation. Diesel particulate matter is highest near the source of emission. Any info regarding DPM and the atmosphere, flora, height, and distance from major sources would be useful to determine health effects.

Control technologies

Main article: Dust collector

Particulate matter emissions are highly regulated in most industrialized countries. Due to environmental concerns, most industries are required to operate some kind of dust collection system to control particulate emissions. These systems include inertial collectors (cyclone collectors), fabric filter collectors (baghouses), wet scrubbers, and electrostatic precipitators.

Cyclone collectors are useful for removing large, coarse particles and are often employed as a first step or "pre-cleaner" to other more efficient collectors. Fabric filters or baghouses are the most commonly employed in general industry. They work by forcing dust laden air through a bag shaped fabric filter leaving the particulate to collect on the outer surface of the bag and allowing the now clean air to pass through to either be exhausted into the atmosphere or in some cases recirculated into the facility. Common fabrics include polyester and fiberglass and common fabric coatings include PTFE (commonly known as Teflon©). The excess dust buildup is then cleaned from the bags and removed from the collector. Wet scrubbers pass the dirty air through a scrubbing solution (usually a mixture of water and other compounds) allowing the particulate to attach to the liquid molecules. Electrostatic precipitators electrically charge the dirty air as it passes through. The now charged air then passes by large electromagnetic plates which attract the charged particle in the airstream collecting them and leaving the now clean air to be exhausted or recirculated.

Climate effects

2005 radiative forcings and uncertainties as estimated by the IPCC.

Atmospheric aerosols affect the climate of the earth by changing the amount of incoming solar radiation and outgoing terrestrial long wave radiation retained in the earth's system. This occurs through several distinct mechanisms which are split into direct, indirect and semi-direct aerosol effects. The aerosol climate effects are the biggest source of uncertainty in future climate predictions. The Intergovernmental Panel on Climate Change, Third Assessment Report, says: While the radiative forcing due to greenhouse gases may be determined to a reasonably high degree of accuracy... the uncertainties relating to aerosol radiative forcings remain large, and rely to a large extent on the estimates from global modelling studies that are difficult to verify at the present time.

Aerosol radiative effects

Global aerosol optical thickness. The aerosol scale (yellow to dark reddish-brown) indicates the relative amount of particles that absorb sunlight.

Direct effect

Particulates in the air causing shades of grey and pink in Mumbai during sunset

The Direct aerosol effect consists of any direct interaction of radiation with atmospheric aerosol, such as absorption or scattering. It affects both short and longwave radiation to produce a net negative radiative forcing. The magnitude of the resultant radiative forcing due to the direct effect of an aerosol is dependent on the albedo of the underlying surface, as this affects the net amount of radiation absorbed or scattered to space. e.g. if a highly scattering aerosol is above a surface of low albedo it has a greater radiative forcing than if it was above a surface of high albedo. The converse is true of absorbing aerosol, with the greatest radiative forcing arising from a highly absorbing aerosol over a surface of high albedo. The Direct aerosol effect is a first order effect and is therefore classified as a radiative forcing by the IPCC. The interaction of an aerosol with radiation is quantified by the Single Scattering Albedo (SSA), the ratio of scattering alone to scattering plus absorption (extinction) of radiation by a particle. The SSA tends to unity if scattering dominates, with relatively little absorption, and decreases as absorption increases, becoming zero for infinite absorption. For example, sea-salt aerosol has an SSA of 1, as a sea-salt particle only scatters, whereas soot has an SSA of 0.23, showing that it is a major atmospheric aerosol absorber.

Indirect effect

The Indirect aerosol effect consists of any change to the earth's radiative budget due to the modification of clouds by atmospheric aerosols, and consists of several distinct effects. Cloud droplets form onto pre-existing aerosol particles, known as cloud condensation nuclei (CCN).

For any given meteorological conditions, an increase in CCN leads to an increase in the number of cloud droplets. This leads to more scattering of shortwave radiation i.e. an increase in the albedo of the cloud, known as the Cloud albedo effect, First indirect effect or Twomey effect. Evidence supporting the cloud albedo effect has been observed from the effects of ship exhaust plumes and biomass burning on cloud albedo compared to ambient clouds. The Cloud albedo aerosol effect is a first order effect and therefore classified as a radiative forcing by the IPCC.

An increase in cloud droplet number due to the introduction of aerosol acts to reduce the cloud droplet size, as the same amount of water is divided between more droplets. This has the effect of suppressing precipitation, increasing the cloud lifetime, known as the cloud lifetime aerosol effect, second indirect effect or Albrecht effect. This has been observed as the suppression of drizzle in ship exhaust plume compared to ambient clouds, and inhibited precipitation in biomass burning plumes. This cloud lifetime effect is classified as a climate feedback (rather than a radiative forcing) by the IPCC due to the interdependence between it and the hydrological cycle. However, it has previously been classified as a negative radiative forcing.

Semi-direct effect

The Semi-direct effect concerns any radiative effect of caused by absorbing atmospheric aerosol such as soot, apart from direct scattering and absorption, which is classified as the direct effect. It encompasses many individual mechanisms, and in general is more poorly defined and understood than the direct and indirect aerosol effects. For instance, if absorbing aerosols are present in a layer aloft in the atmosphere, they can heat surrounding air which inhibits the condensation of water vapour, resulting in less cloud formation. Additionally, heating a layer of the atmosphere relative to the surface results in a more stable atmosphere due to the inhibition of atmospheric convection. This inhibits the convective uplift of moisture, which in turn reduces cloud formation. The heating of the atmosphere aloft also leads to a cooling of the surface, resulting in less evaporation of surface water. The effects described here all lead to a reduction in cloud cover i.e. an increase in planetary albedo. The semi-direct effect classified as a climate feedback) by the IPCC due to the interdependence between it and the hydrological cycle. However, it has previously been classified as a negative radiative forcing.

Roles of different aerosol species

Sulfate aerosol

Main article: stratospheric sulfur aerosols

Sulfate aerosol has two main effects, direct and indirect. The direct effect, via albedo, is a cooling effect that slows the overall rate of global warming: the IPCC's best estimate of the radiative forcing is -0.4 watts per square meter with a range of -0.2 to -0.8 W/m² but there are substantial uncertainties. The effect varies strongly geographically, with most cooling believed to be at and downwind of major industrial centres. Modern climate models addressing the attribution of recent climate change take into account sulfate forcing, which appears to account (at least partly) for the slight drop in global temperature in the middle of the 20th century. The indirect effect (via the aerosol acting as cloud condensation nuclei, CCN, and thereby modifying the cloud properties -albedo and lifetime-) is more uncertain but is believed to be a cooling.

Black carbon

Black carbon (BC), or carbon black, or elemental carbon (EC), often called soot, is composed of pure carbon clusters, skeleton balls and buckyballs, and is one of the most important absorbing aerosol species in the atmosphere. It should be distinguished from organic carbon (OC): clustered or aggregated organic molecules on their own or permeating an EC buckyball. BC from fossil fuels is estimated by the IPCC in the Fourth Assessment Report of the IPCC, 4AR, to contribute a global mean radiative forcing of +0.2 W/m² (was +0.1 W/m² in the Second Assessment Report of the IPCC, SAR), with a range +0.1 to +0.4 W/m²

Instances of aerosol affecting climate

Solar radiation reduction due to volcanic eruptions

Volcanoes are a large natural source of aerosol, and have been linked to changes in the earth's climate, often with consequences for the human population. Eruptions linked to changes in climate include the 1600 eruption of Huaynaputina which was linked to the Russian famine of 1601 - 1603, leading to the deaths of two million, and the 1991 eruption of Mount Pinatubo which cause a global cooling of approximately 0.5°C lasting several years. Research tracking the effect of light-scattering aerosols in the stratosphere during 2000 and 2010 and comparing its pattern to volcanic activity show a close correlation. Simulations of the effect of anthropogenic particles showed little influence at present levels.

Aerosols are also thought to affect weather and climate on a regional scale. The failure of the Indian Monsoon has been linked to the suppression of evaporation of water from the Indian Ocean due to the semi-direct effect of anthropogenic aerosol.

Recent studies of the Sahel drought and major increases since 1967 in rainfall over the Northern Territory, Kimberley, Pilbara and around the Nullarbor Plain have led some scientists to conclude that the aerosol haze over South and East Asia has been steadily shifting tropical rainfall in both hemispheres southward.

The latest studies of severe rainfall declines over southern Australia since 1997 have led climatologists there to consider the possibility that these Asian aerosols have shifted not only tropical but also midlatitude systems southward.

Health effects

Air pollution measurement station in Emden, Germany

See also: Environmental impact of the coal industry

Increased levels of fine particles in the air as a result of anthropogenic particulate air pollution "is consistently and independently related to the most serious effects, including lung cancer and other cardiopulmonary mortality." The large number of deaths and other health problems associated with particulate pollution was first demonstrated in the early 1970s and has been reproduced many times since. PM pollution is estimated to cause 22,000-52,000 deaths per year in the United States (from 2000) and contributed to ~370,000 premature deaths in Europe during 2005.

The effects of inhaling particulate matter that have been widely studied in humans and animals now include asthma, lung cancer, cardiovascular issues, respiratory diseases, birth defects, and premature death. The size of the particle is a main determinant of where in the respiratory tract the particle will come to rest when inhaled. Because of their small size, particles on the order of ~10 micrometers or less (PM₁₀) can penetrate the deepest part of the lungs such as the bronchioles or alveoli. Larger particles are generally filtered in the nose and throat via cilia and mucus, but particulate matter smaller than about 10 micrometers, referred to as PM₁₀, can settle in the bronchi and lungs and cause health problems. The 10 micrometer size does not represent a strict boundary between respirable and non-respirable particles, but has been agreed upon for monitoring of airborne particulate matter by most regulatory agencies.

Similarly, particles smaller than 2.5 micrometers, PM_2.5, tend to penetrate into the gas exchange regions of the lung, and very small particles (< 100 nanometers) may pass through the lungs to affect other organs. Penetration of particles is not wholly dependent on their size; shape and chemical composition also play a part. Therefore simple nomenclature can be used to distinguish between the different degrees of relative penetration of a PM particle into the cardiovascular system. Inhalable particles penetrate no further than the bronchi as they are filtered out by the cilia, Thoracic particles can penetrate right into terminal bronchioles whereas PM which can penetrate to alveoli and hence the circulatory system are termed respirable particles.

A study published in the Journal of the American Medical Association indicates that PM_2.5 leads to high plaque deposits in arteries, causing vascular inflammation and atherosclerosis — a hardening of the arteries that reduces elasticity, which can lead to heart attacks and other cardiovascular problems. The World Health Organization (WHO) estimates that "... fine particulate air pollution (PM(2.5)), causes about 3% of mortality from cardiopulmonary disease, about 5% of mortality from cancer of the trachea, bronchus, and lung, and about 1% of mortality from acute respiratory infections in children under 5 yr, worldwide." doi:10.1080/15287390590936166 PMID 16024504. Researchers suggest that even short-term exposure at elevated concentrations could significantly contribute to heart disease. A study in The Lancet concluded that traffic exhaust is the single most serious preventable cause of heart attack in the general public, the cause of 7.4% of all attacks.

The smallest particles, less than 100 nanometers (nanoparticles), may be even more damaging to the cardiovascular system.

There is evidence that particles smaller than 100 nanometers can pass through cell membranes and migrate into other organs, including the brain. It has been suggested that particulate matter can cause similar brain damage as that found in Alzheimer patients. Particles emitted from modern diesel engines (commonly referred to as Diesel Particulate Matter, or DPM) are typically in the size range of 100 nanometers (0.1 micrometer). In addition, these soot particles also carry carcinogenic components like benzopyrenes adsorbed on their surface. It is becoming increasingly clear that the legislative limits for engines, which are in terms of emitted mass, are not a proper measure of the health hazard. One particle of 10 µm diameter has approximately the same mass as 1 million particles of 100 nm diameter, but it is clearly much less hazardous, as it probably never enters the human body — and if it does, it is quickly removed. Proposals for new regulations exist in some countries, with suggestions to limit the particle surface area or the particle count (numerical quantity).

A further complexity that is not entirely documented is how the shape of PM can affect health. Of course the dangerous feathery shape of asbestos is widely recognised to lodge itself in the lungs with often dire consequences. Geometrically angular shapes have more surface area than rounder shapes, which in turn affects the binding capacity of the particle to other, possibly more dangerous substances.

The inhalable dust fraction is the fraction of dust that enters the nose and mouth and may be deposited anywhere in the respiratory tract. The thoracic fraction is the fraction that enters the thorax and is deposited within the lung airways and the gas-exchange regions. The respiratory fraction is what is deposited in the gas exchange regions (alveoli).

The site and extent of absorption of inhaled gases and vapors are determined by their solubility in water. Absorption is also dependent upon air flow rates and the partial pressure of the gases in the inspired air. The fate of a specific contaminant is dependent upon the form in which it exists (aerosol or particulate). Inhalation also depends upon the breathing rate of the subject.

Researchers at the Johns Hopkins Bloomberg School of Public Health have conducted the largest nationwide study on the acute health effects of coarse particle pollution. Coarse particles are airborne pollutants that fall between 2.5 and 10 micrometers in diameter. The study, published in the May 14, 2008, edition of JAMA, found evidence of an association with hospital admissions for cardiovascular diseases but no evidence of an association with the number of hospital admissions for respiratory diseases. After taking into account fine particle levels, the association with coarse particles remained but was no longer statistically significant.

Particulate matter studies in Bangkok Thailand indicated a 1.9% increased risk of dying from cardiovascular disease, and 1.0% risk of all disease for every 10 micrograms per cubic meter. Levels averaged 65 in 1996, 68 in 2002, and 52 in 2004. Decreasing levels may be attributed to conversions of diesel to natural gas combustion as well as improved regulations.

The Mongolian government agency has recorded a 45% increase in the rate of respiratory illness in the past five years. Bronchial asthma, chronic obstructive pulmonary disease and interstitial pneumonia are the most common ailments treated by area hospitals. Levels of premature death, chronic bronchitis, and cardiovascular disease are increasing at a rapid rate.

Effects on vegetation

Particulate matter can clog stomatal openings of plants and interfere with photosynthesis functions. In this manner high particulate matter concentrations in the atmosphere can lead to growth stunting or mortality in some plant species.

Regulation

Due to the health effects of particulate matter, various governments have created regulations both for the emissions allowed from certain types of pollution sources (motor vehicles, industrial emissions etc.) and for the ambient concentration of particulates. Many urban areas in the U.S. and Europe still frequently violate the particulate standards, though urban air on these continents has become cleaner, on average, with respect to particulates over the last quarter of the 20th century.^{[citation needed]} Much of the developing world, especially Asia, exceed standards by such a wide margin that even brief visits to these places may be unhealthy.^{[citation needed]}

Canada

In Canada the standard for particulate matter is set nationally by the federal-provincial Canadian Council of Ministers of the Environment (CCME). Jurisdictions (provinces) may set more stringent standards. The CCME standard for particulate matter 2.5 (PM2.5) is 30 μg/m3 (daily average, i.e. 24-hour period, 3 year average, 98th percentile).

European Union

The European Commission of the EU has set limits for particulates in the air:

	PM10 from 1 January 2005	PM2.5¹ from 1 January 2015
Yearly average	40 µg/m³	25 µg/m³
Daily average (24-hour) Allowed number of exceedences per year	50 µg/m³ 35	None None

¹ Target value entered into force 1.1.2010. Limit value enters into force 1.1.2015.

Mongolia

Solutions and interventions to reduce PM in Mongolia include fuel gas desulfurization (FGD) technology and electro-static precipitators (ESP) at existing power plants, which are estimated to reduce PM concentrations 10% to 20%. Public awareness must be increased for laws and initiatives such as a 50% rebate on night time electric bills. In February 2011 the "Law on Air Pollution Reduction in the Capital City" was passed. This law includes fines for people and businesses not following limits, and tax incentives to individuals and businesses reducing air pollution. A recent list of the countries that pollute the most published by Daily Finance in 2010 ranks Ulaanbaatar fifth in the world, despite its relatively low population.

United States

The United States Environmental Protection Agency (EPA) sets standards for PM₁₀ and PM_2.5 concentrations in urban air. (See National Ambient Air Quality Standards.) EPA regulates primary particulate emissions and precursors to secondary emissions (NOx, sulfur, and ammonia).

The United States has achieved significant reductions in death and sickness from fine particle (PM2.5) air pollution, and further reductions are expected from science-based federal programs including:

• the Clean Air Act and conforming EPA regulations

• the Cross State Air Pollution Rule

• the Mercury and Air Toxics Standards

• the Light‐Duty Vehicle Tier 2 Rule

• the Heavy Duty Diesel Rule

• the Clean Air Nonroad Diesel Rule

• Regional Haze Regulations

• Guidelines for Best Available Retrofit Technology Determinations

• NOx Emission Standard for New Commercial Aircraft Engines

• Emissions Standards for Locomotives and Marine Compression‐Ignition Engines

• Control of Emissions for Nonroad Spark Ignition Engines and Equipment

• Emissions Reductions from Oceangoing Vessels

• Emissions Standards for Reciprocating Internal Combustion Engines, and

• Amended New Source Performance Standards and Emissions Guidelines for Hospital/Medical/Infectious Waste Incinerators.

The U.S. climate policy under the Bush administration held a goal to cut greenhouse gases by 18% between 2002 and 2012. Bush set out to encourage energy efficiency renewable energy, and agricultural practices. Under the Obama administration the U.S. climate policy sets out to change Corporate Average Fuel Economy (CAFE) standards to 35.5 miles per gallon by 2016, 4 years ahead of the 2007 schedule. In December 2009 Obama participated in the United Nation's Climate Change Conference.

California

In October 2008, the Department of Toxic Substances Control (DTSC), within the California Environmental Protection Agency, announced its intent to request information regarding analytical test methods, fate and transport in the environment, and other relevant information from manufacturers of carbon nanotubes. DTSC is exercising its authority under the California Health and Safety Code, Chapter 699, sections 57018-57020. These sections were added as a result of the adoption of Assembly Bill AB 289 (2006). They are intended to make information on the fate and transport, detection and analysis, and other information on chemicals more available. The law places the responsibility to provide this information to the Department on those who manufacture or import the chemicals.

On January 22, 2009, a formal information request letter was sent to manufacturers who produce or import carbon nanotubes in California, or who may export carbon nanotubes into the State. This letter constitutes the first formal implementation of the authorities placed into statute by AB 289 and is directed to manufacturers of carbon nanotubes, both industry and academia within the State, and to manufacturers outside California who export carbon nanotubes to California. This request for information must be met by the manufacturers within one year. DTSC is waiting for the upcoming January 22, 2010 deadline for responses to the data call-in.

The California Nano Industry Network and DTSC hosted a full-day symposium on November 16, 2009 in Sacramento, CA. This symposium provided an opportunity to hear from nanotechnology industry experts and discuss future regulatory considerations in California.

DTSC is expanding the Specific Chemical Information Call-in to members of the nanometal oxides, the latest information can be found on their website.

Colorado

Key points in the Colorado Plan include reducing emission levels and solutions by sector. Agriculture, transportation, green electricity, and renewable energy research are the main concepts and goals in this plan. Political programs such as mandatory vehicle emissions testing and the prohibition of smoking indoors are actions taken by local government to create public awareness and participation in cleaner air. The location of Denver next to the Rocky Mountains and wide expanse of plains makes the metro area of Colorado's capital city a likely place for smog and visible air pollution.

Affected areas

U.S. counties violating national PM2.5 standards		U.S. counties violating national PM10 standards

Concentration of PM10 in Europe

The most concentrated particulate matter pollution tends to be in densely populated metropolitan areas in developing countries. The primary cause is the burning of fossil fuels by transportation and industrial sources.^{[citation needed]}

Ulaanbaatar

Mongolia's capital city Ulaanbaatar, is affected by choking air pollution caused by coal and wood burning stoves used for heating and cooking. The new market economy of the country and its very cold winter seasons have led to the formation of Ger districts, where 60% of the coldest capital city in the world's population resides. The resulting air pollution problem is characterized by very high concentrations of airborne particles, particulate matter, and by less severe sulphur dioxide and nitrogen oxide levels. Measurements carried out in UB shows that PM is by far the most serious component of the air pollution problem.

During the winter months in particular, urban air obscures vision, and negatively impacts human health. The air pollution also affects the visibility in the city to such an extent that airplanes on some occasions are prevented from landing at the local airport. The annual average temperature in UB is 0 C, making it the world's coldest capital city. About 40% of the population in UB Mongolia lives in apartments, about 80% of them supplied with central heating systems from 3 combined heat and power plants (CHP). The power plants consumed almost 3.4 million tons of coal in 2007. The pollution control technology is in poor condition.

In addition to stack emissions, another unaccounted for source in the emission inventory is the fly ash from the ponds where fly ash is disposed. Removed fly ash is sent to settling tanks where the sedimented dust is collected and sent to the ash pond. These ash ponds are continually subjected to wind erosion in the dry season.

In Ulaanbaatar, Mongolia annual seasonal average particulate matter concentrations have been recorded as high as 279. To put this in perspective, the World Health Organization's recommended PM₁₀ level is 20. This means that UB's PM₁₀ levels are 14 times higher than what is recommended. This also means that UB has left Northern China's most polluted cities in its wake. Compared to such high concentrations, some cities in Northern China and South Asia also had concentrations above 200 micrograms per cubic meter up to a few years ago. The PM levels in Chinese cities are still extreme in recent years, reaching an all-time high in Beijing on Jan. 12, 2013, of 993 micrograms per cubic meter.

See also

• Air pollution
• Clouds
• Criteria air contaminants
• Environmental impact of the coal industry
• Fog
• Wet cooling tower

• Haze
• Particulate mask
• Pea soup fog
• Respirator
• Scrubber
• Global dimming

References

Further reading

• Article at earthobservatory.nasa.gov describing the possible influence of aerosols on the climate
• The Intergovernmental Panel on Climate Change (the principal international scientific body on climate change) chapter on atmospheric aerosols and their radiative effects
• InsideEPA.com, Study Links Air Toxics To Heart Disease In Mice Amid EPA Controversy
• Preining, Othmar and E. James Davis (eds.), "History of Aerosol Science," Österreichische Akademie der Wissenschaften, ISBN 3-7001-2915-7 (pbk.)
• G Invernizzi et al., Particulate matter from tobacco versus diesel car exhaust: an educational perspective. Tobacco Control 13, S.219-221 (2004)
• JEFF CHARLTON Pandemic planning: a review of respirator and mask protection levels.
• Hinds, William C., Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles, Wiley-Interscience, ISBN 0-471-19410-7

External links

• U.S. Environmental Protection Agency resources page: Particulate Matter
• National Pollutant Inventory — Particulate matter fact sheet
• WHO-Europe reports: Health Aspects of Air Pollution (2003) (PDF) and "Answer to follow-up questions from CAFE (2004) (PDF)
• American Association for Aerosol Research
• Particulate Air Pollution
• Aerosol Society — The Development of Aerosol Science in the United Kingdom
• Watch and read 'Dirty Little Secrets', 2006 Australian science documentary on health effects of fine particle pollution from vehicle exhausts
• Aerosol Science and Technology
• Canada-Wide Standards
• Little Green Data Book 2007, World Bank. Lists C02 and PM statistics by country.
• Air Pollution in World Cities (PM10 Concentrations)
• European Environment Agency
• Airborne Particles and their Health Effects — A multinational research network
• Measurement of personal exposure to PM10 in the Non-Workplace Environment using Passive Sampling Techniques by RJ Aitken, LC Kenny and A Soutar. IOM Research Report TM/01/05
• High Aspect Respirable Particles by Dr C Poland
• Integrated Science Assessment for Particulate Matter (Report Without Annexes) (PDF) (1071 pages) 48 MB
• Integrated Science Assessment for Particulate Matter (Annexes Only) (PDF) (1157 pages) 52 MB

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• 5. 静脈血栓症の原因の概要 overview of the causes of venous thrombosis

English Journal

• Effect of process variables on morphology and aerodynamic properties of voriconazole formulations produced by thin film freezing.

• Beinborn NA, Lirola HL, Williams RO 3rd.SourceDivision of Pharmaceutics, College of Pharmacy, The University of Texas at Austin, TX, United States.
• International journal of pharmaceutics.Int J Pharm.2012 Jun 15;429(1-2):46-57. Epub 2012 Mar 13.
• The particle engineering process, thin film freezing (TFF), was used to produce particulate voriconazole (VRC) formulations with enhanced properties. The effect of various processing parameters on the solid state properties and aerodynamic performance of the TFF-processed powders was investigated in
• PMID 22433472

• Polymeric particles for the controlled release of human amylin.

• Guerreiro LH, Da Silva D, Ricci-Junior E, Girard-Dias W, Mascarenhas CM, Sola-Penna M, Miranda K, Lima LM.SourceSchool of Pharmacy, Federal University of Rio de Janeiro - UFRJ, CCS, Bss34, Ilha do Fundão, 21941-617 Rio de Janeiro, RJ, Brazil.
• Colloids and surfaces. B, Biointerfaces.Colloids Surf B Biointerfaces.2012 Jun 1;94:101-6. Epub 2012 Jan 28.
• Since its discovery the therapeutic use of the pancreatic hormone amylin has been limited due to its poor water solubility and propensity for amyloid aggregation. We have entrapped the human amylin protein in polymeric nanoparticles, using a single emulsion-solvent evaporation method and investigate
• PMID 22326343

• Suspension and resuspension of dry soil indoors following track-in on footwear.

• Hunt A, Johnson DL.SourceDepartment of Earth and Environmental Sciences, University of Texas at Arlington, 500 Yates Street, Box 19049, Arlington, TX, 76019-0049, USA, hunt@uta.edu.
• Environmental geochemistry and health.Environ Geochem Health.2012 Jun;34(3):355-63. Epub 2011 Jul 19.
• Contamination of the indoor environment by tracked-in outdoor soil has the potential to pose a significant human health threat through exposure to hazardous soil constituents. The indoor distribution of (contaminated) soil following ingress is important when evaluating exposure risk. Here, the time
• PMID 21769574

Japanese Journal

• Long-term trends of sulfur deposition in East Asia during 1981–2005

• Kuribayashi Masatoshi,Ohara Toshimasa,Morino Yu,Uno Itsushi,Kurokawa Jun-ichi,Hara Hiroshi,栗林 正俊
• Atmospheric environment 59, 461-475, 2012-11
• … The model reproduced the observed spatial distributions in East Asia of the rate of wet deposition of non-seasalt sulfate (nss-SO42−), volume-weighted mean concentrations of nss-SO42− in precipitation, precipitation, and concentrations in air of gaseous sulfur dioxide and particulate nss-SO42−. …
• NAID 120004288250

• 山口県における微小粒子状物質のモニタリング (特集 広域大気汚染をめぐる最近の動向 : 第2弾 自治体における微小粒子状物質モニタリングの実際)

• 長田 健太郎
• 日中環境産業 = Japan-China environmental industry 48(10), 43-46, 2012-10
• NAID 40019448769

• 京都府における微小粒子状物質(PM.)のモニタリングの実際と起源解析の試み (特集 広域大気汚染をめぐる最近の動向 : 第2弾 自治体における微小粒子状物質モニタリングの実際)

• 日置 正
• 日中環境産業 = Japan-China environmental industry 48(10), 27-37, 2012-10
• NAID 40019448753

Related Links

• Particulates - Wikipedia, the free encyclopedia

Particulates – also known as particulate matter (PM), suspended particulate matter (SPM), fine particles, and soot – are tiny subdivisions of solid matter suspended in a gas or liquid. In contrast, aerosol refers to particles and/or liquid droplets ...

• ディーゼル微粒子捕集フィルター - Wikipedia

ディーゼル微粒子捕集フィルター(Diesel particulate filter, DPF) は、ディーゼル エンジンの排気ガス中の粒子状物質を漉し取り軽減させるフィルターである。トラック・ バス・トラクターなどのマフラーなどに装着する。 2003年、八都県市で実施された排気 ガス規制 ...

Related Pictures

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★リンクテーブル★

リンク元	「senescent」「microsphere」「微粒子」「粒子」「粒状」
拡張検索	「high efficiency particulate air filter」「high-efficiency particulate air filter」「suspended particulate matter」

「senescent」

　　[★]

• adj.

• 老化の

The spleen is involved with the removal of senescent red blood cells, bacteria, and other particulates from the circulation through elements of the monocyte-macrophage system.

関

ageing、aging、senescence、senile、senility

　

「microsphere」

　　[★]

• n.

• 微粒子、細粒、小球体、ミクロスフェア、マイクロスフェア

関

blob、fine grain、fine granule、latex bead、latex particle、microbead、microparticle、particulate

「微粒子」

　　[★]

英

microsphere、particulate、microparticle、fine grain

関

細粒、小球体、微小粒子、マイクロスフェア、ミクロスフェア、粒子、粒子性、粒状

「粒子」

　　[★]

英

particle、grain、particulate

関

木目、穀物、子実、グレイン、微粒子、粒子性、粒状

「粒状」

　　[★]

英

granular、particulate

関

顆粒、顆粒状、微粒子、粒子、粒子性

「high efficiency particulate air filter」

　　[★]

英

HEPA filter high efficiency particulate air filter

同

高性能微粒子除去装置

関

ヘパフィルター HEPAフィルター

「high-efficiency particulate air filter」

　　[★]

• HEPAフィルター、高性能微粒子フィルター

関

HEPA filter

「suspended particulate matter」

　　[★] 浮遊粒子状物質, SPM