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The size of particulates in the air is the driving force for air pollution regulations designed to protect the health of exposed individuals. The particles of greatest concern are 10 microns or less (PM10), 2.5 microns or less (PM2.5) or 100 nanometers or less (nanoparticles).

1. Would the chemical composition of these particles also contribute to their toxicity? Which one do you think is more important, chemistry or size?

Please, again choose only one option.

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