Today’s noon SF air raid siren test more meaningful than usual. Thoughts with those who lost homes & loved ones in fires, and those struggling with unhealthy air.
Protect your lungs: wear an N95 mask, use a HEPA air purifier at home.
Real time AQI: https://www.purpleair.com/map#8.19/37.712/-122.425/-1.5
1-2 hour delay averages: https://cfpub.epa.gov/airnow/index.cfm?action=airnow.local_city&cityid=317