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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
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Air District’s Clean HEET Program now accepting applicationsMarch 13, 2025
The Air District’s Clean HEET Program is now accepting applications for grants that can help to offset the cost of switching from wood-burning or pellet-burning stoves, fireplace inserts, or open-hearth fireplaces to an electric heat pump. A decommission-only option is also available for homeowners to remove existing open-hearth fireplaces or older, uncertified wood-burning stoves or inserts. Switching to an electric heat pump helps improve air quality in communities by replacing polluting wood-burning devices with cleaner heating options.
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Air District launches Charge! Program, expanding Bay Area access to electric vehicle chargersMarch 05, 2025
The Air District is announcing the launch of the Charge! Program’s grant application process to access at least $10 million in grant funding to offset the cost of purchasing and installing new chargers for light-duty electric vehicles at multi-family housing facilities, destinations, transit parking locations, and workplaces across the Bay Area. This funding is available to businesses, homeowner associations, non-profits, public agencies, and tribes. Applications are being accepted now through June 6, 2025, at 5PM.
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It has been reported that companies throughout the Bay Area have received letters dated January 1, 2025, February 1, 2025, and February 14, 2025, with misinformation about the Bay Area Commuter Benefits Program. These letters were not sent by the Bay Area Air District or the Metropolitan Transportation Commission and contain misinformation. Please disregard these letters if you received them. If your company is registered in the Commuter Benefits Program, you can check the Commuter Benefits Program website to verify your company's registration in the system.
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February 13, 2025
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February 01, 2025
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Other News Articles
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.
Climate
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.
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.
Spare the Air Status
Last Updated: 4/21/2017