What are the smoke and health risks from the Boyle Heights fire?

June 22, 2026 - 04:41

Residents across East Los Angeles are bracing for another wave of poor air quality as the massive warehouse fire in Boyle Heights continues to burn. The blaze, which ignited Wednesday at a sprawling industrial complex, has sent thick plumes of black smoke over the neighborhood and beyond. Firefighters remain on the scene, but officials warn that the smoke could linger for days.

The primary concern is particulate matter, specifically PM2.5. These tiny particles can lodge deep in the lungs and enter the bloodstream. Health officials are urging people in the area to stay indoors, keep windows and doors closed, and run air purifiers if available. Those with asthma, COPD, heart conditions, or other respiratory issues are at the highest risk. Symptoms to watch for include coughing, shortness of breath, chest tightness, and eye or throat irritation.

Because the fire involves warehouses, there is also the potential for toxic chemicals to be released. Burning plastics, electronics, and industrial materials can produce hazardous fumes. The Los Angeles County Department of Public Health has issued a smoke advisory, but has not yet released specific data on what materials are burning. They recommend that anyone who smells smoke or sees ash should limit outdoor activity entirely.

For now, the advice is simple: if you can see or smell smoke, you are being exposed. N95 masks can offer some protection if you must go outside, but staying indoors with filtered air is the safest bet. The fire is expected to burn for several more days, meaning the health risks will not disappear overnight.