Noun
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)
Source: WordNetMy Turn is the distilled bathwater of Mrs. Reagan's life. It is for the most part sweetish, with a tart edge of rebuke, but disappointingly free of dirt or particulate matter of any kind. Barbara Ehrenreich
Particulate matter can ravage human health, according to the EPA, with its effects ranging from an irregular heartbeat to premature death. Source: Internet
Several toxicants have been found in mainstream Shisha smoke including Nicotine, Carbon monoxide, Carcinogenic, Polycyclic Aromatic Hydrocarbons, Aromatic Amines, Aldehyde Furanic and Phenolic compounds, Tar, Particulate matter, Heavy metals, and Ammonia. Source: Internet