Learn what the air quality index (AQI) means, how it impacts your health, and how to stay safe when pollution is high.

Fortunately, the US Environmental Protection Agency has a resource called the Air Quality Index to help monitor air quality.

Over 200 is the purple (very unhealthy ... that’s allowing it to get into these valleys.” Colin said the air quality index ...

Indicators like the Air Quality Index (AQI), commonly used to track air pollution levels, provide a rough sense of the ...

An AQI of 50 or below represents good air quality and won't pose risks ... If the AQI is over 200 in your area — this should show as a purple color on a map — then health risks are increased ...

VOV.VN - Hanoi and the northern provinces are facing severe air pollution, which is expected to improve slightly but will persist in the coming days, prompting the Ministry of Health to issue a ...