Grangeville Air Monitoring Station, Idaho | United States Environmental Monitoring

The Grangeville Air Monitoring Station is an operational air quality monitoring facility located at the USFS Compound on the east edge of Grangeville, Idaho. It is part of the state's ambient air monitoring network managed by the Idaho Department of Health and Welfare-Environment Division. The station contributes to the U.S. EPA's Air Quality System (AQS) network, which tracks criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. As a regulatory monitoring station, Grangeville operates under the Clean Air Act and EPA monitoring guidelines. The station's siting follows EPA representativeness criteria to ensure data reflects local air quality. Continuous monitoring supports compliance with National Ambient Air Quality Standards (NAAQS) and provides data for public health advisories. The station's last reported sample date is June 30, 2025, indicating ongoing operations. The station serves the community of Grangeville and surrounding areas in Idaho County. Its data helps assess regional air quality trends, particularly in a rural setting influenced by agricultural activities and forest management. The monitoring contributes to state and federal efforts to protect public health and the environment through informed regulatory decisions.

Grangeville is located in north-central Idaho, a region characterized by forested landscapes and agricultural valleys. Air quality monitoring here is important due to potential impacts from wildfires, agricultural burning, and seasonal inversions. The station's parameter coverage typically includes criteria pollutants to assess compliance with NAAQS. Siting at the USFS Compound ensures representative sampling of background and local sources. Reporting continuity through the Idaho Department of Health and Welfare supports long-term trend analysis and regulatory reporting.