PM 2.5 (Day 139)

The San Francisco Bay Area air quality is UNHEALTHY for the past 3 days.
https://www.purpleair.com/map?opt=1/a/lt/mAQI/a60/cC0#8/37.301/-121.638

The toxic smoke from the "ring of fire" makes it impossible to open the windows. It is worse than the Napa wildfire a few years ago.

What's going on in year 2020???