The stubble fire burn season will end Wednesday in the San Francisco Bay Area, said Ralph Borrmann, spokesperson for the Bay Area Air Quality Management District.

That’s the last day the district will give permission for stubble burning, he said.

Stubble fires burn off the remaining stalks, stems and trucks of plants or cereal grass such as oats, wheat and hay after a field crop has been harvested.

Nor will open burning be allowed during Winter Spare the Air alerts, Borrmann said.

“Open burning is regulated because of its impact on air quality,” he said.

Borrmann said certain types of fires, such as those for agricultural purposes, flood control, fire training and the prevention of fire hazards, are allowed when weather conditions are favorable, particularly during specified times of the year.

“Each day of the year is designated as either a ‘burn’ or a ‘no burn’ day, and permissible fires can only be set during their established burn season on a designated ‘burn day,’” he said.

The open burning requirements apply to the nine counties in the Bay Area, including southwestern Solano County as well as Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara and southern Sonoma counties, Borrmann said.

Those interested in reading the district’s open burning Regulation 5 may visit the website www.baaqmd.gov, type “Open Burning Regulation 5” into the search field and click on the link that appears at the top of the search results page.

Open burn information is also available through the Air District’s toll-free number, 800-HELP AIR (435-7247), Borrmann said.

The Bay Area Air Quality Management District is the regional agency responsible for protecting air quality in the nine-county Bay Area.

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