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 ...

Wildfire smoke contains small particles that can cause serious health problems. Several parts of Southern California are currently under a windblown dust and ash advisory as deadly wildfires ...

Yet even in areas that aren’t burning, plumes of smoke remain a serious and ongoing public health threat—especially as the region braces for dangerous winds that could fuel the spread of ash ...