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air quality index
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Diagram explaining air quality index (AQI) levels with a color-coded bar from green (good) to maroon (hazardous), describing health risks as air quality moves from healthy to unhealthy. Thick brown layer of smog obscures the Los Angeles skyline, with city buildings and neighborhoods visible beneath a blue sky.
New York City skyline tinted orange from wildfire smoke.
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air quality index: Media

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Videos

How Is Air Quality Measured?
Even something as simple as breathing can get complicated.
Video: Encyclopædia Britannica, Inc.

Images

Air Quality Index (AQI) values and their explanation.
The AQI is a tool that describes health risks in breathable air as air quality moves...
Encyclopædia Britannica, Inc.
Los Angeles smog
A pall of photochemical smog over Los Angeles in November 2016. Photochemical smog,...
© Daniel Stein—iStock/Getty Images
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