The index ranges from 0 to 500 and uses a color coded system: As of Monday evening, the AQI was between 30 and 60 throughout L.A. County — in the “good” or “moderate” range — according ...

This year, the air quality in Delhi, Noida, Ghaziabad and Gurugram has reached “alarmingly high”, with most places crossing the 500 AQI mark. Highlighting the severity of the situation ...

Delhi AQI today: The air quality in Delhi ... Major Dhyan Chand Stadium and several other places touched the 500-mark at 5am on Tuesday, prompting concerns about health and safety.

Source: AQI numbers from Environmental Protection Agency. Air Pollution Index is based on the incidence of airborne lead, NO2, particulate matter, carbon monoxide and ozone depletion.