If you have been hearing about poor air quality in New York City Friday, you can breathe a deep sigh of relief (literally): ...

The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

The Vietnamese capital of Hanoi was the world's most polluted city for much of January 2025, with the hazardous smog posing ...

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

What doesn't AQI tell us? The Air Quality Index does not take into account many gas or particle ... But the remnants of the smoke and ash that blanketed the city are still settling, and those present ...

That year, Canadian wildfires sent smoke sweeping across much of the U.S., engulfing the New York City ... the American Lung Association. But earlier in 2024, multiple states issued air quality ...

Wildfires are tearing through thousands of acres in Los Angeles County in California, as strong Santa Ana winds stoke the blazes.