To combat air pollution, we must first understand PM2.5 — the minuscule particles that fuel it. At just 2.5 micrometres, they ...

Erin Davis/Axios Visuals Air quality in Salt Lake City is getting worse, according to year-over-year data. Why it matters: Long-term exposure to poor air quality is harmful to our health. By the ...

People returning to homes in burn areas should wear N95 masks, gloves and booties as they search through rubble or clean away ...

As wildfires have burned recently across southern California, the ash from burned trees and brush is lifted in the air, then ...

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

Data reviewed by Caltech scientists found spikes of lead, chlorine and bromine in the air after the Eaton fire started.

Farmworkers are left with little to no protection from wildfire smoke. L.A. County's recent fires put the lack of protection into perspective.

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

But Griselda Ellez, who picks leeks in California’s Ventura County, said she had no option but to continue working, even as ...

Toxic chemicals from L.A.'s fires are going under-reported and pose serious long-term risks, a group of lawmakers say. They want the EPA to create a task force.

It’s hard to envision Prishtina, Kosovo’s capital, experiencing a winter without being one of the cities with the most ...