“[San Francisco] air quality is 3 times worse than Beijing”

“The Air Quality Index for San Francisco Thursday was 152, qualifying as “unhealthy.” At this level, even those without respiratory diseases may begin to experience negative side effects, such as coughing, trouble breathing and irritated eyes and airways. Parts of the East Bay, including Oakland and Berkeley, and the South Bay were also in the “unhealthy” air quality range…”

https://www.sfgate.com/weather/article/air-quality-wildfire-smoke-fog-gray-breathe-health-13178427.php