Regulatory monitors fail to measure ammonium nitrate aerosol, masking its importance as a top aerosol pollutant in Los Angeles.

This report describes an increase in particulate matter lead levels in Los Angeles, California during the January 2025 fires.

Paul Wennberg discusses the air quality following the 2025 California fires and how to clean homes downwind of the fires.

An instrument suite operated by Caltech researchers in Pico Rivera gathers data on particulate matter all day, every day, and saw the changes associated with the Los Angeles fires.

The findings give new insight into the dangers of urban wildfires that burn plastics and other chemicals in homes and property.