particulate matter definition

  • noun:
    • Material suspended floating around in the shape of min solid particles or fluid droplets, particularly when considered as an atmospheric pollutant.
    • Any solid or fluid in a finely subdivided condition, specially when thought to be an atmospheric pollutant.
    • a tiny discrete mass of solid or fluid matter that remains individually dispersed in gasoline or liquid emissions (usually considered to be an atmospheric pollutant)

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