Overview
Gresham - Centennial High School (GCH) is an operational air monitoring station in Gresham, Oregon, operated by the Oregon Department of Environmental Quality. It contributes to the US EPA Air Quality System network, tracking criteria pollutants to s
Gresham - Centennial High School (GCH) is an air monitoring station located at 30505 SE 182nd Avenue in Gresham, Multnomah County, Oregon. Operated by the Oregon Department of Environmental Quality, it is part of the broader US EPA Air Quality System (AQS) network, which monitors ambient air quality across the United States. The station serves the Portland metropolitan area, providing data on criteria pollutants such as ozone, particulate matter, and nitrogen dioxide. As an AQS monitoring site, GCH follows federal reference methods and quality assurance protocols outlined in 40 CFR Part 58. The station's siting is designed to be representative of population exposure in a suburban residential area near major transportation corridors. Typical equipment includes continuous analyzers for gaseous pollutants and filter-based samplers for particulate matter, with data reported hourly to the EPA's AirNow platform. The station plays a key role in Oregon's air quality management, supporting state implementation plans for National Ambient Air Quality Standards (NAAQS). Its data helps assess regional air quality trends, inform public health advisories, and evaluate the effectiveness of emission reduction strategies. The station's location at a high school also facilitates community engagement and environmental education.
Environmental context
The Gresham area lies in the Portland-Vancouver-Hillsboro metropolitan statistical area, which faces air quality challenges from transportation emissions, industrial sources, and occasional wildfire smoke. The station's placement at Centennial High School provides representative monitoring of suburban exposure, complementing urban and rural sites in the region. Parameter coverage typically includes ozone, PM2.5, PM10, nitrogen dioxide, and sulfur dioxide, aligning with EPA criteria pollutant requirements. Siting follows EPA siting criteria to ensure data representativeness for population exposure and regulatory compliance.
Frequently asked questions
The station is located at 30505 SE 182nd Avenue in Gresham, Multnomah County, Oregon, on the campus of Centennial High School.
As part of the EPA AQS network, the station typically monitors criteria pollutants including ozone, particulate matter (PM2.5 and PM10), nitrogen dioxide, and sulfur dioxide, following federal reference methods.
The station is operated by the Oregon Department of Environmental Quality (DEQ), which manages the state's ambient air monitoring network.
Data from the station is used to assess compliance with National Ambient Air Quality Standards (NAAQS), inform state implementation plans, and provide real-time air quality information to the public via AirNow.
AQS is the EPA's national repository for ambient air quality data, containing measurements from thousands of monitoring stations across the US. It supports regulatory decision-making, trend analysis, and public reporting.
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