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Marin County
Learn about Marin County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in Marin County and read about local efforts to improve air quality.
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Air quality advisory for smoke from fire at MRC Refinery in MartinezFebruary 01, 2025
The Air District is issuing an air quality advisory for smoke in Contra Costa and Solano counties due to a fire at MRC’s Martinez refinery.
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Air District asks public not to light firecrackers and fireworks or burn wood over Lunar New Year holidayJanuary 28, 2025
The Air District is asking the public not to light fireworks or burn wood over the Lunar New Year holiday to keep air quality from becoming unhealthy.
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Air District launches new name and brandingJanuary 22, 2025
The Bay Area Air District is announcing its new name and logo. The new look symbolizes the Air District’s new direction through recent leadership changes, reflecting a modernized brand that helps the agency stay connected and effective in its mission.
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December 30, 2024
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December 08, 2024
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Upcoming Events
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FEB252025
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MAR042025
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MAR052025
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11/30/2024 Spare the Air Alerts issued for Sunday and Monday due to wood smoke pollution
November 30, 2024
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11/26/2024 Air District asks public to not burn wood over Thanksgiving holiday
November 26, 2024
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11/19/2024 Air District to host Clean Air Talk in San Lorenzo on December 7
November 19, 2024
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11/12/2024 Air District to represent Bay Area at COP29
November 12, 2024
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11/6/2024 Air District releases woodsmoke white paper for public comment
November 6, 2024
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10/31/2024 Air District and CARB fine Valero Refining Co. $82 million for air quality violations
October 31, 2024
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10/25/2024 Air District issues air quality advisory for Friday and Saturday
October 25, 2024
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10/18/2024 Air District issues air quality advisory for Friday
October 18, 2024
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10/17/2024 Air District to host Clean Air Talk in East Palo Alto on November 2
October 17, 2024
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10/17/2024 Air District fines Radius Recycling, formerly Schnitzer Steel, $575,000 for air quality violations
October 17, 2024
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10/8/2024 Air District issues air quality advisory for Novato
October 8, 2024
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10/8/2024 Air District to host Building Appliance Rules learning session on October 22
October 8, 2024
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10/7/2024 Air District to host public meeting on Radius Recycling permit application
October 7, 2024
Marin County lies south of Sonoma County, bounded by the Pacific Ocean to the west, San Pablo Bay to the east, and the Golden Gate to the south. One Marin County representative sits on the Air District’s Board of Directors.
Climate
The west coast and southern portions of Marin County are often subject to cool marine air and substantial fog. Temperatures in these areas remain steady through the year because of the nearby ocean. The eastern side of Marin County is warmer and has less fog, due in large part to its distance from the ocean. The extra distance from the ocean allows the marine air to be heated before arriving at eastern Marin cities. Prevailing winds throughout the county are generally from the northwest, with wind speeds highest along the west coast. Annual rainfall in the mountains is generally higher than in most parts of the Bay Area, averaging 37 to 49 inches. The majority of rainfall across the county occurs November through March.
Interactive Air Monitoring Stations Map
Air Quality in Marin 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.
Along the Marin County coast and in southern Marin County, clean air from the Pacific Ocean helps to keep air pollution at a minimum. Elsewhere in Marin, ozone only rarely becomes a concern, but the hilly terrain and colder winter temperatures can trap PM2.5 near the surface, resulting in air quality that exceeds health standards.
Last Updated: 4/21/2017