IEPA-RAPS TRAILER Air Monitoring Station, East Saint Louis, Illinois | Environmental Monitoring

IEPA-RAPS TRAILER is an operational air monitoring station located at 13th & Tudor in East Saint Louis, Illinois, United States. It is part of the Illinois Environmental Protection Agency's monitoring network, which feeds data into the US EPA Air Quality System (AQS). The station supports ambient air quality surveillance in the St. Louis metropolitan area, a region with significant industrial and transportation emissions. The station operates under the regulatory framework of the US Clean Air Act, which mandates National Ambient Air Quality Standards (NAAQS) for criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. As a trailer-based monitoring site, it likely provides flexibility in siting to capture representative air quality data in urban and industrial zones. The Illinois EPA coordinates with the US EPA to ensure data quality and reporting continuity. Environmental monitoring at this site helps assess compliance with air quality standards and informs public health advisories. The station's location in East Saint Louis, near major highways and industrial facilities, makes it valuable for understanding local pollution gradients. Data from this station supports community exposure assessments and regulatory decision-making in the region.

The monitoring station is situated in East Saint Louis, an urban area with a mix of industrial, commercial, and residential land uses. The region is influenced by emissions from transportation corridors, manufacturing, and power generation. Air quality monitoring here focuses on criteria pollutants and may include speciation for volatile organic compounds or metals. The site's representativeness is enhanced by its placement in a mixed-use area, capturing both background and source-impacted conditions.