Overview
ISU Harris Physical Plant is an operational air monitoring station in Normal, Illinois, operated under the Illinois Environmental Protection Agency. It contributes to the US EPA Air Quality System network.
ISU Harris Physical Plant is an air monitoring station located in Normal, McLean County, Illinois, United States. It is part of the state-level ambient air quality monitoring network managed by the Illinois Environmental Protection Agency, which reports data to the US EPA Air Quality System (AQS). The station supports the assessment of criteria pollutants and other atmospheric parameters in the region. The station operates under the regulatory framework of the US Clean Air Act and the National Ambient Air Quality Standards (NAAQS). As a fixed-site monitor in a mixed urban-institutional setting near Illinois State University, it provides representative data for population exposure and compliance purposes. The station's last reported sample date is September 30, 2025, indicating recent active operation. Environmental monitoring at this location helps track air quality trends in the Bloomington-Normal metropolitan area, which hosts educational institutions, light industry, and transportation corridors. Continuous data from such stations supports public health advisories and state implementation plans for air quality improvement.
Environmental context
The station is situated in Normal, Illinois, a town with a mix of university, residential, and commercial land uses. Air monitoring in this area typically focuses on criteria pollutants such as ozone, particulate matter, and nitrogen dioxide, which are influenced by local traffic, power generation, and regional transport. The Illinois EPA's network ensures compliance with NAAQS and provides data for the EPA's AirNow program.
Frequently asked questions
The station is located at Main & Gregory streets in Normal, Illinois, USA, on the campus of Illinois State University.
The station is operated by the Illinois Environmental Protection Agency, which manages the state's ambient air monitoring network.
As part of the Illinois EPA network, the station likely monitors criteria pollutants such as ozone, particulate matter (PM2.5 and PM10), nitrogen dioxide, sulfur dioxide, and carbon monoxide, in accordance with US EPA requirements.
Data from this station is reported to the US EPA Air Quality System (AQS) and used to determine compliance with National Ambient Air Quality Standards (NAAQS) under the Clean Air Act.
Normal is part of the Bloomington-Normal metropolitan area, which includes educational institutions, manufacturing, and transportation. Monitoring helps assess population exposure and supports state air quality management plans.
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