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FAQ, how to get alert of outdoor air quality?

Air Quality Index (API) icon which show the OUTDOOR air quality.  There are six levels, which is developed by the United States Environmental Protection Agency (EPA) to report air quality.  The US AQI is based on the six "criteria" pollutants including ground-level ozone, particulate matter PM2.5 & PM10, carbon monoxide, sulfur dioxide, and nitrogen dioxide.

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