CDF Air Monitoring Station, Arroyo Grande, California | Environmental Monitoring

CDF is an air monitoring station located at 2391 Willow Road in Arroyo Grande, California, within San Luis Obispo County. The station is operational and reports to the San Luis Obispo County Air Pollution Control District (APCD), which manages air quality monitoring in the region. As part of the broader US EPA Air Quality System (AQS) network, CDF plays a role in tracking criteria pollutants and supporting regulatory compliance. The station operates under the framework of the Clean Air Act and EPA monitoring requirements, which mandate consistent sampling of pollutants such as ozone, particulate matter, and nitrogen dioxide. While specific parameters measured at CDF are not detailed, typical stations in California's Central Coast region monitor ozone and PM2.5 due to local pollution sources including agriculture and transportation. The last reported sample date is September 30, 2025, indicating recent active data collection. CDF's location in Arroyo Grande provides coverage for a semi-rural area near the coast, complementing urban monitors in larger cities. Its data supports public health advisories and state implementation plans for air quality. The station's operation by a county-level agency reflects the decentralized nature of air monitoring in the United States, where local districts often manage networks tailored to regional needs.

Arroyo Grande lies in California's Central Coast region, where air quality is influenced by marine layer inversions, agricultural emissions, and seasonal wildfire smoke. The area is designated as moderate nonattainment for ozone under EPA standards. Monitoring stations like CDF are critical for tracking pollutant trends and ensuring compliance with the National Ambient Air Quality Standards (NAAQS). The station's siting in a rural-urban interface helps assess population exposure and background concentrations.