To protect yourself
Stay inside with doors and windows closed. Do not use air conditioners or heaters that bring in air from the outside.
If you are not home, seek out public spaces like libraries, movie theaters or shopping malls that use recirculated air. Call ahead to make sure they have air filters.
In San Francisco, these libraries have air filters and are open on Friday during the following hours:
San Francisco Main Library, 100 Larkin St., noon to 6 p.m.
Chinatown Branch Library, 1135 Powell St., 1 to 6 p.m.
Mission Bay Branch Library, 960 Fourth St., 1 to 6 p.m.
Glen Park Branch Library, 2825 Diamond St., 1 to 6 p.m.
If you are outside, limit exertion.
Wear a mask that keeps out small particles. N95 masks are the most common and can be purchased at hardware stores, pharmacies or stores like Walmart.
Seek medical attention if you have difficulty breathing, wheezing, chest pain, nausea or dizziness that is not resolved by going inside or getting away from smoke.