Smoke and ash could poison plankton and other organisms that form the foundation of the marine food chain, biologists say.

Health officials are again warning the public to take precautions as Santa Ana winds are expected to spread ash and dust from ... Experts say that wildfire smoke is unsafe for everyone and that ...

Along with the wildfires, residents must deal with other hazards: smoke and ash. Smoke is made of tiny particles. Smoke particles 2.5 micrometers or smaller in size—known as PM2.5—are ...

LOS ANGELES (KABC) -- In some areas where evacuation orders are being lifted, people are returning to homes covered in ash and soot. Inside, it's likely going to smell like smoke. Some of that ...