Jisho

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浮遊粒子状物質
Wikipedia definition
1. ParticulatesParticulates – also known as particulate matter (PM), suspended particulate matter (SPM), respirable suspended particle 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 and the gas together. Sources of particulate matter can be man made or natural. Air pollution and water pollution can take the form of solid particulate matter, or be dissolved.
Read “Particulates” on English Wikipedia
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