Types of Pollution: Particulate Particulate pollution, as the name suggests, is made up of tiny particles, most of which you can't see unless they're clumped together. "You're worried about those that are 10 microns in size or smaller," says Tadlock. "A human hair is 70 microns, so these particles are significantly smaller." They're so small, in fact, that they get into our pores -- and that's where they do their damage. "It looks like those very fine particles cause skin aging," says Tadlock. "Nobody really knows how it works yet, but there's evidence. And whoever is living in the places with the highest levels of pollution is most susceptible."
Stateoftheair.org measures the particulate pollution over the last 24 hours. (This morning, my air was a C, which isn't great, but at least it passed.)
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