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

An air quality alert was issued on Tuesday at 5:03 a.m. for Josephine County.

The AQI is measured on a scale from 0 to 500, with the lower the number, the healthier the air. (Getty Creative) ...

Weather conditions are trapping smoke and other air pollutants near the ground where people breathe, officials said.

The Air Quality Index (AQI) — which measures the concentration of pollutants in the air — seemed to confirm all was well in the L.A. atmosphere, with low numbers that suggested clean ...

Indicators like the Air Quality Index (AQI), commonly used to track air pollution levels, provide a rough sense of the ...

All implementing agencies have been requested to maintain strict vigilance and intensify steps of the extant schedule of GRAP ...

Fearless journalism is more important than ever. When news breaks, you need to understand what actually matters — and what to do about it. At Vox, our mission to help you make sense of the world ...

Angelenos still bothered by the smell of smoke may be surprised to see that Air Quality Index numbers returned to “healthy” or “moderate” levels this week in L.A. County, but they shouldn ...

Toxic smoke and dangerous particulate pollution are spreading far beyond the flames, leaving air quality at unhealthy levels ...