Vallejo is a vibrant, diverse city of about 125,000 residents in Solano County, located at the northeastern edge of the San Francisco Bay Area and within the Bay Area Air Quality Management District (BAAQMD).

Vallejo faces significant air pollution concerns from nearby petroleum refineries, industrial activity on Mare Island, heavy traffic on Interstate 80, and legacy contamination sites. These sources contribute to high rates of asthma-especially among Black residents and in South and Central Vallejo-along with elevated risks for cardiovascular disease and other pollution-related health issues. Community-driven air monitoring and advocacy have played a key role in raising awareness and pushing for cleaner air.

The district has teamed up with Aclima and the California Air Resources Board (CARB) to launch a community air monitoring project guiding future actions as a part of SMMI. Using Aclima’s advanced sensors, the project collects detailed, block-by-block data on air quality throughout the community. This provides residents with clear information about local pollution and helps guide actions to improve air quality, focusing on the areas and people most affected.

In April of 2025, Vallejo residents and stakeholders came together as part of the Statewide Mobile Monitoring Initiative to discuss these pressing air quality challenges and explore solutions for a healthier, more equitable future.