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1:07Now PlayingAir quality on high alert: Explaining the dangers of red flag warnings | USA TODAY
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1:07Now PlayingAir quality is impacted by numerous factors. Here's what to know about red flag warnings.
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Air quality alerts are indicators the air is unsafe to breathe for certain people. Alerts are triggered by a number of factors, including the detection of fine-particle pollution — known as “PM 2.5” — which can irritate the lungs.
Pollution is detected by a system of monitors on the ground “constantly taking measurements of the amount of chemicals and particles in the air,” said Susan Anenberg, professor and department chair of environmental and occupational health at George Washington University.
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