Why air quality alerts matter
On some days the air outside is more harmful than it looks. Tiny particles and gases from traffic, industry, and heating can reach levels that irritate your lungs and heart, even if the sky appears clear.

Learn how to read air quality alerts and take simple, practical steps to protect your health on high-pollution days.
On some days the air outside is more harmful than it looks. Tiny particles and gases from traffic, industry, and heating can reach levels that irritate your lungs and heart, even if the sky appears clear.
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