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Frequently asked questions

What is PM2.5?

Ultrafine particles such as aerosols or gases.

What is PM10?

Particulate matter smaller than 10 microns, includes pollen, dust, pet dander and allergens from plants and flowers.

Where does Nitrogen dioxide (NO2) come from?

Found in high concentrations near roadways, as NO2 often comes from car exhaust fumes.

Can indoor air be as polluted as outdoor air?

Yes, in fact, it can be up to 5x worse than outdoor air, according to the EPA.