As strong Santa Ana winds sweep across Los Angeles County through Wednesday evening, the South Coast Air Quality Management District in Southern California warned dust and ash from the burning wildfires may impact air quality in the region.

Children, older adults, those who are pregnant, and people with heart or lung conditions are at most risk, but small particles in the dust and ash may cause irritation or aggravate pre-existing health conditions in anyone, the health departments says.

For safety, officials advise residents to stay inside with windows and doors closed and use an air purifier or run air conditioners on recirculate mode, if possible. If people must go outside, they should wear an N95 or P100 mask and goggles.

Masks are available at public libraries, recreation centers and senior centers, Los Angeles Mayor Karen Bass said at a news conference this week.