As Los Angeles grapples with increasing wildfire intensity, new findings demonstrate concerning levels of lead and chlorine polluting the air, raising health alarms.
L.A. Wildfires Trigger Alarming Spikes in Airborne Toxins

L.A. Wildfires Trigger Alarming Spikes in Airborne Toxins
Recent research reveals significant increases in hazardous chemicals, emphasizing the dangers of urban wildfires.
The latest research from atmospheric scientists indicates that during the peak of the recent wildfires in Los Angeles County, concentrations of lead reached alarming levels—up to 100 times higher than average, even several miles away from the flames. Additionally, chlorine levels surged to 40 times the standard measurements, contributing to the dangers posed by burning urban infrastructures.
These findings, published by The New York Times, highlight the urgent need to consider the implications of urban wildfires. According to Haroula Baliaka, a Ph.D. candidate in atmospheric chemistry at Caltech, the resurgence of material ignitions from homes and vehicles leads to a more complex and hazardous smoke composition. As climate change escalates fire incidents in populated areas, there is a growing concern about the potential toxic exposure.
The airborne lead, commonly associated with older residential materials like paints and piping, can cause significant health risks, particularly for children. Recent readings indicated that lead levels exceeded EPA safety thresholds by more than three times. Similarly, elevated chlorine concentrations pose serious threats to lung and respiratory health.
Historically, high levels of particulate matter in wildfire smoke have been linked to increased cardiovascular and respiratory issues. Previous studies estimate that wildfire smoke contributed to the premature deaths of approximately 12,000 Californians in 2018, linking these incidents to broader environmental health concerns.
Contributions from the newly established Airborne Chemical and Environmental Assessment (ASCENT) network have enabled these real-time measurements, reflecting a paradigm shift in how urban wildfire impacts are assessed. The monitoring station in Pico Rivera, which is several miles from the wildfire, is instrumental in capturing and analyzing air quality data during these critical moments.
As urban wildfires continue to become an urgent focus for environmental scientists, the unique nature of urban wildfires demonstrates the different and more toxic particles introduced during these events, drastically affecting community health and safety.
These findings, published by The New York Times, highlight the urgent need to consider the implications of urban wildfires. According to Haroula Baliaka, a Ph.D. candidate in atmospheric chemistry at Caltech, the resurgence of material ignitions from homes and vehicles leads to a more complex and hazardous smoke composition. As climate change escalates fire incidents in populated areas, there is a growing concern about the potential toxic exposure.
The airborne lead, commonly associated with older residential materials like paints and piping, can cause significant health risks, particularly for children. Recent readings indicated that lead levels exceeded EPA safety thresholds by more than three times. Similarly, elevated chlorine concentrations pose serious threats to lung and respiratory health.
Historically, high levels of particulate matter in wildfire smoke have been linked to increased cardiovascular and respiratory issues. Previous studies estimate that wildfire smoke contributed to the premature deaths of approximately 12,000 Californians in 2018, linking these incidents to broader environmental health concerns.
Contributions from the newly established Airborne Chemical and Environmental Assessment (ASCENT) network have enabled these real-time measurements, reflecting a paradigm shift in how urban wildfire impacts are assessed. The monitoring station in Pico Rivera, which is several miles from the wildfire, is instrumental in capturing and analyzing air quality data during these critical moments.
As urban wildfires continue to become an urgent focus for environmental scientists, the unique nature of urban wildfires demonstrates the different and more toxic particles introduced during these events, drastically affecting community health and safety.