Many Bay Area residents woke up to a double whammy Monday morning: scorching temperatures and smoky air. Again.
Air quality in the Bay Area began to deteriorate early Monday morning, as smoke from several Northern California wildfires — including the new, out-of-control Glass Fire in St. Helena — pushed into the region.
The combination of wildfire smoke and balmy temperatures will likely choke a region already wearied by weeks of poor air quality this month. Officials urged people to stay inside.
Shortly after 7 a.m., much of San Francisco was considered unhealthy for sensitive groups, according to air quality tracking website PurpleAir. But the air was even worse in parts of the East and South Bay, where it was considered unhealthy for all groups, according to PurpleAir. And the site warned of “serious health effects” from the air in Santa Rosa, Rohnert Park and surrounding areas.
The new Glass Fire in St. Helena, which ignited just before 4 a.m. Sunday, was responsible for much of the smoke, according to the Bay Area Air Quality Management District. Wind gusts reached 60 miles per hour on Mount St. Helena on Sunday evening, with the winds blowing toward the southwest.
Satellite view that we use to track fog and clouds can show fires: Note the black spot in Napa Co heading toward Santa Rosa. #BoysenFire #GlassFire #ShadyFire #CAwx pic.twitter.com/Xxw5uq1Tfx
— NWS Bay Area (@NWSBayArea) September 28, 2020
The air was considered hazardous in parts of the North Bay, where multiple wildfires were burning. The sky turned a deep red in Santa Rosa, as several blazes — the Glass, Shady and Boysen fires — threatened the area. Ash fell from the sky.
Dangerous fire conditions are expected to continue through Monday evening. The combination of the winds and heat are expected to exacerbate existing fires, and make it easier for new ones to ignite.
The regional air district extended a Spare the Air warning it had issued Sunday through Monday and urged residents in areas affected by wildfire smoke to stay indoors.
A red flag warning has been issued for much of Northern California, stretching from the Oregon border down to San Jose.
Chronicle staff writer Sarah Ravani contributed to this report.
Trisha Thadani is a San Francisco Chronicle staff writer. Email: tthadani@sfchronicle.com Twitter: @TrishaThadani
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Bay Area choked by wildfire smoke and unhealthy air — again - San Francisco Chronicle
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