AC Transit has canceled all services running this Friday to schools across Alameda County and Contra Costa County in response to widespread school closures due to poor air quality.

In a statement released Thursday evening, AC Transit spokesperson Robert Lyles said buses will not stop at schools across the East Bay after both Alameda County and Contra Costa County canceled Friday classes at public schools because of the poor air quality. Among the schools that canceled classes are Berkeley City College and those in the Berkeley Unified School District.

The public transit agency will not stop at schools in cities including Berkeley, Emeryville, Oakland and Richmond.

Air quality in the Bay Area has been getting steadily worse since the Camp Fire started burning last Thursday in Butte County. It has since become the most destructive wildfire in California’s history.