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PM10 and PM2.5 are regulated by the EPA.

Why are particles larger than 10 micrometers not regulated?

A

Larger particles are filtered out by the nose and throat.

B

Larger particles quickly settle to the ground to form dust.

C

Few large particles are created during combustion reactions.

D

Larger particles are not carcinogens.

E

People are usually not exposed to the larger particles.

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