Weaver-AA Air Monitoring Station, Festus, Missouri | United States Environmental Monitoring

Weaver-AA is an air monitoring station located at 802 Weaver Road in Festus, Jefferson County, Missouri, United States. The station is operational and reports data to the US EPA Air Quality System (AQS) network, with the most recent sample collected on March 31, 2025. As a fixed-site monitor, it contributes to the national ambient air quality monitoring infrastructure. The station operates under the regulatory framework of the US Clean Air Act, which mandates monitoring of criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. While specific parameters measured at Weaver-AA are not detailed, typical stations in the Ameren Missouri network monitor ozone and meteorological parameters to support air quality management and public health protection. Located in a mixed industrial and residential area near the Mississippi River, Weaver-AA helps characterize regional air quality in eastern Missouri. Its data supports state implementation plans for attaining National Ambient Air Quality Standards (NAAQS) and provides the public with real-time air quality information through the AirNow platform.

Weaver-AA operates in Jefferson County, Missouri, a region with industrial sources including power generation and manufacturing. The station's siting is representative of suburban/rural background air quality, complementing urban monitors in St. Louis. Its reporting continuity, with recent data from March 2025, supports trend analysis for ozone and particulate matter. The station's role in the Ameren Missouri network underscores its importance for compliance monitoring under the EPA AQS framework.