About the Air District

Solano County

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

Latest News
  • Jan

    January 12, 2021

    Air District’s Charge! Program offers $6 million for electric vehicle charging stations

    The Air District is announcing the availability of $6 million through the Charge! program, which provides grant funding to offset the cost of purchasing and installing new publicly accessible chargers for light-duty electric vehicles.

  • Dec

    December 28, 2020

    Air District settles case with Chevron USA Inc.

    The Air District announced today that Chevron USA Inc. has agreed to pay $147,000 to settle violations at its refinery in Richmond. This settlement covers 29 Notices of Violation issued for air quality violations at the Richmond oil refinery during 2016 – 2018.

  • Dec

    December 21, 2020

    Spare the Air Alert extended through Tuesday due to wood smoke buildup

    The Air District is issuing the winter season’s third Spare the Air Alert for tomorrow, Tuesday, December 22, which bans burning wood, manufactured fire logs or any other solid fuel, both indoors and outdoors. Smoke from increased wood burning is expected to cause air quality to be unhealthy with the heaviest impacts in the Santa Clara Valley due to cold overnight temperatures and light winds.

Solano County is bordered by Napa and Yolo counties to the north, Sacramento County to the east, and San Pablo Bay to the south. The Air District only has jurisdiction over the southwestern portion of the county, which includes Vallejo and Fairfield. One Solano County representative sits on the Air District’s Board of Directors.


During summer and fall months, high pressure offshore, coupled with thermal low pressure in the Central Valley, draws marine air eastward through the Carquinez Strait almost daily. Temperatures along the coast and inland tend to remain moderate. Winter temperatures range from cool overnight to moderate during the day, while summer temperatures range from moderate overnight to warm during the day. Afternoon westerly winds are common in the southern portion of the county, along the Carquinez Strait. Annual rainfall totals range from 13 inches near the coast to 22 inches inland in Fairfield.

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

Interactive Air Monitoring Stations Map

Air Quality in Solano 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 summer, most of Solano County is exposed to prevailing westerly winds through the Carquinez Strait, which mixes and reduces ozone levels by drawing cooler, marine air from the Pacific Ocean and San Pablo Bay eastward. However, when the marine flow is weak or nonexistent, ozone levels may exceed health standards on a few days each year, mainly east of Suisun City.

In Solano County, PM2.5 concentrations can become elevated enough to exceed health standards during the winter when air pollution is transported from the Central Valley due to prevailing easterly winds. Local residential wood burning can also cause elevated particulate levels on cold, calm evenings during winter.

Interactive Air Quality Forecast Map

Resource Team

Solano County’s Spare the Air Resource Team promotes ways to reduce air pollution in the local community.

Spare the Air Status

Last Updated: 2/14/2019