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) But many ...

Canadian wildfire smoke is affecting air quality in parts of Michigan. The EPA's air quality index (AQI) uses a color-coded scale to inform the public about air quality and associated health risks.

This post was updated Jan. 20 at 10:09 p.m. Wildfires in the Pacific Palisades have burned over 6,000 structures, releasing toxic smoke that threatens Los Angeles residents’ health. Although UCLA has ...

The Sacramento region's air quality reached "unhealthy for sensitive groups" level on Thursday morning, according to IQAir.

Firefighters work inside a burned structure. After California’s Eaton fire was suppressed in January, invisible gases continued to permeate the air, exposing residents and first responders to ...

GRAP is a set of incremental anti-pollution measures that are triggered to prevent further worsening of air quality once it ...

In the heart of Delhi, at a spot popular for picnics in Delhi's crisp winter, a group of protestors are demanding their right to breathe freely. "Why, as a parent, am I being forced to make a choice ...

Smoke from Canadian wildfires is causing air quality concerns and hazy skies for many Americans in the Midwest and Northeast for another day this week. A map of the current Air Quality Index, the ...