About the Air District

San Francisco County

Learn about San Francisco County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in San Francisco County and read about local efforts to improve air quality.

Latest News
  • Oct

    October 14, 2021

    Air District to provide home air filtration units in West Oakland

    The Air District is working with the West Oakland Environmental Indicators Project and the West Oakland Health Council, through the Clean Air Filtration Program, to provide portable air filtration units to low-income residents of West Oakland diagnosed with a respiratory illness.

  • Oct

    October 6, 2021

    Air District relaunches Clean Cars for All program on Clean Air Day

    The Air District has relaunched its Clean Cars for All program with more than $8 million available for qualified residents to purchase a clean air vehicle. 

  • Oct

    October 3, 2021

    Air District issues air quality advisory for Monday

    The Air District is issuing an air quality advisory for wildfire smoke for Monday, October 4. Smoke from wildfires in Southern California is expected to continue impacting the Bay Area on Monday with smoky and hazy skies. Pollution levels are not expected to exceed federal health standards and no Spare the Air Alert is in effect for Monday. A Spare the Air Alert for ozone, or smog, remains in effect for Sunday, October 3.

San Francisco County rests at the northern end of the San Francisco Peninsula, bounded by San Mateo County in the south, the Pacific Ocean to the west, San Francisco Bay to the east, and the Golden Gate Bridge to the north. Three San Francisco County representatives sit on the Air District’s Board of Directors.


Because most of San Francisco's landscape is below 200 feet, the marine layer flows across most of the city, creating a cool and windy climate. The southeastern portion of the county, however, tends to be warmer and sunnier, with fewer foggy days. In the winter, average daily temperatures are mild overnight and moderate during the day, while summertime temperatures tend to remain moderate throughout the season. The highest wind speeds are focused along the western coast and generally mild throughout the county. Rainfall averages about 20 inches per year, with the highest amounts reported on the western coast.

San Francisco County's climate is also affected by regional Bay Area climate influences.

Interactive Air Monitoring Stations Map

Air Quality in San Francisco County

Ozone and fine particle pollution, or PM2.5, are the major regional air pollutants of concern in the San Francisco Bay Area. Ozone is primarily a problem in the summer, and fine particle pollution in the winter.

In San Francisco, ozone almost never exceeds health standards and PM2.5 only exceeds the national standard once or twice each year, generally. Being surrounded by water on three sides keeps temperatures within a narrow range, whereby winter low temperatures rarely reach freezing and summer high temperatures stay well below levels where ozone would form and become unhealthy.

Interactive Air Quality Forecast Map

Resource Team

San Francisco County Spare the Air Resource Team promotes ways to reduce air pollution in the local community.

Spare the Air Status

Last Updated: 2/14/2019