Breathing the smoke-filled air in San Francisco today is equivalent to smoking more than a half-pack of cigarettes, researchers say.
San Francisco’s air quality on Friday registered “very unhealthy” levels of particulate matter, following public health warnings and mass closures of schools, universities and businesses. As of Friday at 11 a.m., the Air Quality Index (AQI) for San Francisco read 246, a measurement that indicates the concentration of particulate matter less than 2.5 micrometers in diameter (PM2.5) in the air over a period of time. Continue reading “Here’s why researchers say breathing San Francisco air today is like smoking 11 cigarettes”

