Sheldahl, Southern Crossroads Air Monitoring Station, Polk City, Iowa

Sheldahl, Southern Crossroads is an air monitoring station located at 15795 NW 58th Street in Polk City, Iowa, United States. Operated by Polk County Physical Planning, the station is part of the local air quality monitoring network and contributes to the US EPA Air Quality System (AQS). The station is operational and reported a last sample date of October 31, 2025. As an air monitoring station, it measures criteria pollutants and other parameters to assess ambient air quality in accordance with the Clean Air Act and EPA regulations. The station's location in Polk County, Iowa, provides representative data for the region's urban and suburban air quality, supporting regulatory compliance and public health protection. The station plays a key role in the community by providing data used for air quality index reporting, health advisories, and environmental research. Its continuous operation ensures long-term trend analysis and supports the goals of the National Ambient Air Quality Standards (NAAQS).

Polk City, Iowa, is part of the Des Moines metropolitan area, where air quality monitoring focuses on pollutants such as ozone, particulate matter, and nitrogen dioxide. The station's siting is representative of suburban residential areas, providing data on background pollution levels. Its reporting continuity supports compliance with EPA monitoring requirements and contributes to the regional air quality management plan.