Carbon dioxide makes up less than one-twentieth of 1% of Earth's atmosphere. How does this relatively scarce gas control Earth's thermostat?
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Even a small cloud can weigh as much as four tonnes – but gravity, chemistry and temperature keep them floating in the sky.
New research is spotlighting personal care products, such as shampoos and skin lotions, as a significant source of chemicals that contribute to urban air pollution.
Earth's ozone layer shields us from harmful ultraviolet radiation. Nations have been working to reduce ozone-depleting chemicals since the 1980s, but recent studies show that there is still work to do.
Intense wildfires in southern California are triggering air quality alerts. Health experts know surprisingly little about how inhaling smoke affects human health, especially over the long term.
Wildfires in California have triggered a public health emergency. One threat is smoke inhalation: Some air readings have registered pollution levels comparable to bad air days in Beijing or Mumbai.
Top contributors
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Associate Professor of Environmental Health Sciences, University of Massachusetts Amherst
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Professor of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill
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Professor of Chemistry and Atmospheric Science, Colorado State University
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Research scientist, University of Colorado Boulder
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Associate Professor of Atmospheric Composition, University of Leeds
