[Answer] Which of these is a source for particulate matter in the air?

Answer: Automobiles dust and fires
Which of these is a source for particulate matter in the air?

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 matteris highest near the source of emission. Any information regarding DPM and the atmosphere flora height and distance from major sources is useful to determine health …

Particulate pollution is pollution of an environment that consists of particles suspended in some medium. There are three primary forms: atmospheric particulate matter marine debris and space debris. Some particles are released directly from a specific source while others form in chemical reactions in the atmosphere. Particulate pollution can be derived from either natural sources or anthropogenic processes.

Diesel exhaust (DE) is a major contributor to combust…

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