The Air District has awarded $1.18 million grant to the San Ramon Valley Unified School District to replace seven older school buses, five compressed natural gas buses and two diesel buses with zero-emission electric buses and the charging infrastructure to support them. The project will also support the installation of eight DC fast chargers and related infrastructure.
-
About the Air District
- Advisory Council
- Air District Leadership
- Air District Logos
- Bay Area Clean Air Foundation
- Board of Directors
- Community Advisory Council
- Contracting Opportunities
- Departments
- Diversity Equity and Inclusion
- Enterprise Systems Catalog
- Hearing Board
- History of Air District
- In Your Community
- Job Opportunities
- Mission Statement
- Speakers and Tours
- News & Events
- Online Services
- Publications
- Forms
- Public Records
- Contact Us
- Login
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
-
-
Air District opens Clean Cars for All program with $10 million in fundingSeptember 11, 2025
The Air District has relaunched its Clean Cars for All program with more than $10 million available from state and local funding sources for income-qualified Bay Area residents to purchase cleaner air vehicles.
Learn More -
Air District strengthens leadership team, staffing to deliver on permitting priorities & strategic goalsSeptember 10, 2025
Changes focus on improving efficiency and delivering timely, transparent permit decisions.
Learn More -
Air District fines Chemtrade West US LLC $160,000 for air quality violationsSeptember 02, 2025
The Air District has fined Chemtrade West US LLC $160,000 for air quality violations at its sulfuric acid manufacturing plant in Richmond, which is connected to the Chevron Richmond refinery. Chemtrade supplies various chemical products to industry, including sulfuric acid, which is a byproduct of refining crude oil.
Learn More -
-
August 26, 2025
-
-
-
Upcoming Events
-
SEP182025
-
SEP232025
-
SEP302025
-
OCT012025
-
OCT022025
Other News Articles
-
8/23/2025 Air District extends air quality advisory for wildfire smoke through Monday
August 23, 2025
-
8/22/2025 Air District extends air quality advisory for wildfire smoke through Saturday
August 22, 2025
-
8/21/2025 Air District issues air quality advisory for wildfire smoke through Friday
August 21, 2025
-
8/19/2025 Air District and Tesoro reach $75,000 settlement with enhanced requirements for air monitoring and transparency
August 19, 2025
-
8/18/2025 Air District directs Crown Hill Materials to cease operating unpermitted concrete batch plant
August 18, 2025
-
8/14/2025 Air District files lawsuit against Acme Fill Corporation for illegal landfill emissions
August 14, 2025
-
8/12/2025 Air District issues air quality advisory for wildfire smoke for Tuesday
August 12, 2025
-
8/11/2025 Air District reaches agreement with Argent Materials to resolve air quality violations
August 11, 2025
-
7/30/2025 Deadline to apply for the Air District’s Clean HEET program extended
July 30, 2025
-
7/28/2025 Air District awards $3.5 million in second cycle of James Cary Smith Community Grant Program
July 28, 2025
-
7/23/2025 Air District urges Bay Area to proactively prepare for smoke this wildfire season
July 23, 2025
-
7/17/2025 Air District and Alameda County District Attorney announce enforcement actions against Radius Recycling, formerly Schnitzer Steel
July 17, 2025
-
7/14/2025 Air District lifts air quality advisory for wildfire smoke for Monday
July 14, 2025
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.
Climate
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.
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.
Spare the Air Status
Last Updated: 4/21/2017