WordNet

air pollution caused by fine particles of soot (as from power plants or diesel engines)
slight or limited; especially in degree or intensity or scope; "a series of death struggles with small time in between"
a garment size for a small person
the slender part of the back
limited or below average in number or quantity or magnitude or extent; "a little dining room"; "a little house"; "a small car"; "a little (or small) group" (同)little
have fine or very small constituent particles; "a small misty rain"
on a small scale; "think small"
a body having finite mass and internal structure but negligible dimensions (同)subatomic_particle
a function word that can be used in English to form phrasal verbs
undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities

PrepTutorEJDIC

(大きさが)『小さい』,小形の;(量が)『少ない』,わずかな / 『取るに足りない』,ささいな(trivial) / 《名詞の前にのみ用いて》(仕事・活動などが)『小規模の』,ささやかな / 心が狭い,利己的な / (音・声が)弱い,小さい / (文字が)小型の,小文字の / 《the~》小さいもの;(…の)細い部分《+『of』+『名』》 / 《複数形で》《英》(衣類・ハンカチなどの)小物,小間物 / 小さく,細かく / (声などが)低く,弱く / 小規模に,こぢんまりと
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
(…を)『汚すこと』,汚染すること;(…が)『汚されていること』《+『of』+『名』》 / 汚染物質(地域)

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Gong Y1, Tang J1, Zhao D2.
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笹原弘之,原昌範,田中信成,浜野瑞樹
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… Recently, the machining process is conducted in the closed machine, and such small particles are evacuated outside with the mist collector. … In this study, the amount of the small particles of oil mist and smoke was measured in the working environment under various conditions. … It was shown that the air pollution can be avoided by using the aid of mist collector with high performance filter, especially for very small particle smaller than 0.3μm. …
NAID 130004949584