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It wasn’t that long ago that few people were monitoring the air—not the government, not its citizens. Today, weather apps provide estimates of outdoor air quality, and the government’s own air quality monitoring website, AirNow , has an easy-to-use zip code portal and fire and smoke map .

There are real health benefits to owning an air quality monitor . Each US state is responsible for developing its own monitoring plan . Even in densely populated urban areas, outdoor air monitors owned by federal, state, and local jurisdictions might be geographically spread out, leaving monitoring gaps

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