The Air District and the California Air Resources Board are announcing a nearly $82 million penalty in a joint case to address significant air pollution violations by Valero Refining Co. at its Benicia refinery. This penalty is the largest ever assessed in the Air District’s history.
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A Healthy Breathing Environment For Every Bay Area Resident
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Napa County
Learn about Napa County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in Napa County and read about local efforts to improve air quality.
Napa County is nestled in a valley between the Maycamas Mountains in the west and the Vaca Mountains in the east. One Napa County representative sits on the Air District’s Board of Directors.
Latest News
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Air District issues air quality advisory for Friday and SaturdayOctober 25, 2024
The Air District is issuing an air quality advisory due to smoke for Friday, October 25 and Saturday, October 26. Smoke from prescribed fires near Pescadero may impact air quality along the Peninsula – south of San Francisco and north of San Jose. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict.
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Air District issues air quality advisory for FridayOctober 18, 2024
The Air District is issuing an air quality advisory due to wildfire smoke from fires around the Bay Area for Friday, October 18. Smoke from wildfires including the Keller Fire in the East Bay may impact air quality in parts of the Bay Area Friday. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict.
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Air District to host Clean Air Talk in East Palo Alto on November 2October 17, 2024
The Air District will host an in-person conversation with Air District Board Chair Davina Hurt on Saturday, November 2, 2024, from 12 noon – 1 PM at the East Palo Alto Community Room in the East Palo Alto Public Library. The conversation will focus on community questions and concerns regarding air quality issues and climate change.
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October 08, 2024
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Other News Articles
Climate
The mountains bordering Napa Valley block much of the prevailing northwesterly winds throughout the year. Sunshine is plentiful in Napa County, and summertime can be very warm in the valley, particularly in the northern end. Winters are usually mild, with cool temperatures overnight and mild-to-moderate temperatures during the day. Wintertime temperatures tend to be slightly cooler in the northern end of the valley. Winds are generally calm throughout the county. Annual precipitation averages range from about 24 inches in low elevations to more than 40 inches in the mountains.
Interactive Air Monitoring Stations Map
Air Quality in Napa 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 Napa County, ozone rarely exceeds health standards, but PM2.5 occasionally does reach unhealthy concentrations. There are multiple reasons for PM2.5 exceedances in Napa County. First, much of the county is wind-sheltered, which tends to trap PM2.5 within the Napa Valley.
Second, much of the area is well north of the moderating temperatures of San Pablo Bay and, as a result, Napa County experiences some of the coldest nights in the Bay Area. This leads to greater fireplace use and, in turn, higher PM2.5 levels. Finally, in the winter easterly winds often move fine-particle-laden air from the Central Valley to the Carquinez Strait and then into western Solano and southern Napa County.
Spare the Air Status
Last Updated: 4/21/2017