Overview
San Ysidro Air Monitoring Station in San Diego, California, is part of the NEAR ROAD network operated by the San Diego County Air Pollution Control District. It monitors criteria pollutants near roadways to assess traffic-related air quality impacts.
San Ysidro Air Monitoring Station is an operational air monitoring facility located at 198 W. San Ysidro Blvd in San Diego, California. It is part of the NEAR ROAD network, which focuses on measuring air pollutant concentrations in close proximity to major roadways. The station is operated by the San Diego County Air Pollution Control District, which oversees air quality management in the region. The station collects air quality data as part of the U.S. EPA's Air Quality System (AQS) network, which supports compliance with National Ambient Air Quality Standards (NAAQS). NEAR ROAD stations are strategically sited to capture traffic-related pollutants such as nitrogen dioxide, particulate matter, and carbon monoxide. The station's last reported sample date was December 31, 2024, indicating ongoing monitoring activities. Located near the U.S.-Mexico border, the San Ysidro station plays a key role in assessing cross-border air quality impacts and local traffic emissions. Its data supports regulatory decision-making and public health advisories for the San Diego metropolitan area. The station contributes to a comprehensive understanding of urban air pollution patterns and helps evaluate the effectiveness of emission control strategies.
Environmental context
The San Ysidro station operates within the regulatory framework of the U.S. Clean Air Act and the EPA's AQS network. Its NEAR ROAD designation ensures siting representativeness for traffic-related pollution, capturing pollutants like NO2, PM2.5, and CO. The station's location near the border adds complexity due to transboundary emissions. Reporting continuity is maintained by the San Diego County Air Pollution Control District, which provides consistent data for trend analysis and compliance assessments.
Frequently asked questions
The San Ysidro Air Monitoring Station is located at 198 W. San Ysidro Blvd in San Diego, California, United States.
As part of the NEAR ROAD network, the station monitors criteria air pollutants near roadways, including nitrogen dioxide, particulate matter, and carbon monoxide, to assess traffic-related air quality impacts.
The station is operated by the San Diego County Air Pollution Control District, which is responsible for air quality management in the San Diego region.
Air monitoring in the U.S. is governed by the Clean Air Act and implemented through the EPA's Air Quality System (AQS) network, which sets National Ambient Air Quality Standards (NAAQS) for criteria pollutants.
Located near the U.S.-Mexico border and major roadways, the station provides critical data on traffic emissions and cross-border pollution, supporting public health advisories and regulatory compliance in the San Diego area.
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