The AQI is measured on a scale from 0 to 500, with the lower the number, the healthier the air. (Getty Creative) But many Angelenos aren’t sure if the AQI tells the full story, especially given how ...

PHILADELPHIA (WPVI) -- With smoke blowing into the Philadelphia region from the wildfires in Canada, you may have heard a lot about the Air Quality Index or AQI. But what it is, exactly? The Air ...

When air quality is poor, fine particulate matter (PM 2. 5, PM10), nitrogen dioxide, and other contaminants can travel deeper ...

According to data from the Central Pollution Control Board, the Air Quality Index remained in the ‘very poor' category at ...

Environmentalists and data experts said India’s air quality measurement standards are looser than in countries such as the ...

Editor’s Note: CNN has an agreement with Copernicus to provide air quality data. The content below is provided by Copernicus, but CNN’s weather team has verified the information and methodology. The ...

Delhi recorded a thick blanket of smog on December 15, 2025, with the Air Quality Index (AQI) settling at 450, according to the Air Quality Early Warning System (AQEWS) for Delhi at 11 am, which falls ...

The Commission for Air Quality Management on Saturday reimposed Stage 3 restrictions under the Graded Response Action Plan to ...

Delhi's air quality plummets to severe levels, with Jahangirpuri recording an alarming AQI of 498 amid thick smog.

Delhi's air quality plunges to 'severe' levels, with smog causing health concerns and schools shifting to hybrid classes.