Smithfield Air Monitoring Station, Smithfield, Utah | Environmental Monitoring in the USA

Smithfield is an operational air monitoring station located at 675 West 220 North in Smithfield, Cache County, Utah, United States. It is part of the state's ambient air quality monitoring network managed by the Utah Department of Environmental Quality. The station contributes to the US EPA Air Quality System (AQS) network, which tracks criteria pollutants and other parameters to assess compliance with National Ambient Air Quality Standards (NAAQS). The station operates under the regulatory framework of the Clean Air Act and EPA monitoring guidelines. Typical air monitoring stations in Utah measure pollutants such as PM2.5, PM10, ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide, and lead, along with meteorological parameters. The station's last reported sample date was October 31, 2025, indicating ongoing data collection. Smithfield is situated in Cache Valley, a region known for wintertime temperature inversions that can trap pollutants, making local air quality monitoring particularly important. The data collected supports public health advisories and helps inform state implementation plans for air quality improvement. The station's location in a residential area provides representative measurements for community exposure assessment.

Cache Valley experiences frequent winter inversions that trap emissions from vehicles, agriculture, and residential heating, leading to elevated PM2.5 levels. The Smithfield station's monitoring of criteria pollutants is critical for tracking these episodes and ensuring compliance with NAAQS. Its siting in a mixed residential and agricultural area provides representative data for population exposure and supports the state's air quality management programs.