Some of the world’s major cities actually have clean air. Find out more about what these big cities are doing to keep the air clean. And find out how you can improve your community’s air quality.
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Ammonia (NH3) is a corrosive, colorless gas with a distinctive, pungent odor that causes air pollution as a secondary particulate precursor. Learn more.
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Pet dander, consisting of tiny particles shed from animals' skin, fur, or feathers, can trigger allergies and respiratory issues in susceptible individuals.
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