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

The Air Quality Index, set by the Environmental Protection Agency, is your guide to how bad the air quality is outdoors. The data that goes into the Air Quality Index comes from 5,000 air monitors ...

But air quality can vary on a hyperlocal scale, meaning the network of official sites is "fairly ... level that really matters to people," he says. The Air Quality Index does not take into account ...

Angelenos still bothered by the smell of smoke may be surprised to see that Air Quality Index numbers returned ... or are in an area with high AQI levels. That means don’t exercise, keep your ...

Those groups particularly sensitive to particulate matter in the air may want to limit time outside Friday and Saturday.

Specialized air quality instruments captured a spike in lead, chlorine, and bromine pollution during the L.A. wildfires.

Sensitive ecosystems are damaged by air pollution, and related illnesses take a toll on the healthcare system. If air quality affects human health, does it ... the Air Quality Index or AQI is ...

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

Since the Clean Air Act ... when the Air Quality Index or AQI is between 0 and 50. Generally speaking, moderate AQI levels between 51 and 100 are acceptable but might not be ideal for those with ...