Microscopic particles in the air, whether from wildfire smoke or other sources of air pollution such as industrial and automobile exhaust, are dangerous: Their size allows them to penetrate deep into the body, even entering the lungs and bloodstream. Fires in California have polluted the skies as far away as New York City. These particles can travel for thousands of miles and remain suspended in the air for weeks. Every one of these fires kicks up tiny particles of liquids and solids, each a fraction of the diameter of a single human hair. The United States has faced nearly 44,000 wildfires this year alone, and altogether they have burned an area the size of New Jersey.
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