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

Even though the Palisades and Eaton fires are now mostly contained, the Santa Ana winds have led to new fires flaring up ...

Toxic chemicals from L.A.'s fires are going underreported and pose serious long-term risks, a group of lawmakers says. They ...

Researchers from McMaster University in Ontario, Canada have found that smoke from wildfires can transport toxic pollutants ...

Even if you don't live in an area where wildfires are typical, it's important to know how to protect your health.

In the wake of the Palisades and Eaton fires, concerns about air quality across the county have been on the rise.

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

Los Angeles residents will have to cope with the effects of smoke-related unhealthy air, the Los Angeles County Health ...

Even with thick smoke coming from the Hughes Fire, skies have been clear in many areas, and the air quality forecast has been ...

Doctors from National Jewish Health talk about how to know if you’re at risk, and steps you can take to protect your heart ...

As crews work to clean up from the Los Angeles wildfires, city officials and residents are opposing the designation of a ...

Thousands of farmworkers labored in fields in Ventura County, Calif. in late January in wildfire smoke. They have little to ...