Add Yahoo as a preferred source to see more of our stories on Google. The AQI is measured on a scale from 0 to 500, with the lower the number, the healthier the air. (Getty Creative) (BlackSalmon via ...

Add Yahoo as a preferred source to see more of our stories on Google. A dog walks along the shores of Lake Superior amid heavy wildfire smoke Thursday, July 16, 2026, in Duluth, Minn. (AP Photo/Scott ...

Wildfire smoke health risks are far higher than standard air quality models show, WMO finds: conventional PM2.5 risk models ...

In recent days, the air quality index has been at "Unhealthy" levels in New York City from the Canadian wildfires smoke. People have been warned to avoid outdoor physical activities. Those who spend ...

Here’s how to understand the Environmental Protection Agency’s Air quality index (AQI), which measures, on a 300-point scale (along with six categories and advisories), the quality of air in any given ...

Dhaka, Sept. 18 -- Dhaka ranked 4th among the world's cities with the worst air quality on Friday morning, recording an Air Quality Index (AQI) score of 165 at 8:30 am.