Articles on atmospheric chemistry

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False-color image of ozone concentrations above Antarctica on Oct. 2, 2015. NASA/Goddard Space Flight Center

Is Earth’s ozone layer still at risk? 5 questions answered

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.
Flames and smoke shroud State Route 33 as a wildfire burns in Ventura, California, Dec. 5, 2017. Daniel Dreifuss via AP

Exposure to wildfire smoke: 5 questions answered

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.
Wildfire creates an orange glow in a view from a hilltop Oct. 13, 2017, in Geyserville, California. AP Photo/Marcio Jose Sanchez

Wildfire smoke and health: 5 questions answered

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.

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