The Air District has announced the appointment of prominent environmental justice leader Arsenio Mataka as deputy executive officer for Equity & Community Programs at the agency's Community, Health and Environmental Justice Committee meeting.
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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.
The Air District has announced the appointment of prominent environmental justice leader Arsenio Mataka as deputy executive officer for Equity & Community Programs at the agency's Community, Health and Environmental Justice Committee meeting.
The Air District is announcing that its independent Hearing Board has ordered Martin Marietta to get a permit for the company’s sand distribution plant located at Pier 92 in Bayview Hunters Point, San Francisco. The Hearing Board has also imposed restrictions on the plant’s operations to reduce emissions and protect public health.
The Air District has fined the City of Berkeley $130,000 for air quality violations that occurred at its landfill site at Cesar Chavez Park in Berkeley from 2019 - 2022.
The Air District’s Clean Heating Efficiently with Electric Technology, or Clean HEET, Program will begin accepting applications for grants that can help to offset the cost of switching from a wood-burning stove or fireplace insert to an electric heat pump. The program is designed to improve air quality in communities by replacing polluting wood-burning heating devices with cleaner heating options.
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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.
Napa County’s climate is also affected by regional Bay Area climate influences.
Interactive Air Monitoring Stations Map
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.
Last Updated: 4/21/2017