Overview
The Dalles - Wasco Library (TWL) is an operational air monitoring station in The Dalles, Oregon, operated by the Oregon Department of Environmental Quality. It contributes to the US EPA Air Quality System network, tracking criteria pollutants to prot
The Dalles - Wasco Library (TWL) is an air monitoring station located at 722 Court Street in The Dalles, Oregon, within the Columbia River Gorge region. Operated by the Oregon Department of Environmental Quality, it is part of the nationwide US EPA Air Quality System (AQS) network, which monitors ambient air quality to ensure compliance with National Ambient Air Quality Standards (NAAQS). As a fixed-site monitoring station, TWL typically measures criteria pollutants such as ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. The station's siting in a library area provides representative data for urban and residential exposure. Monitoring follows EPA-approved methods and quality assurance protocols to ensure data accuracy and continuity. The station plays a key role in tracking air quality trends in The Dalles and Wasco County, supporting public health advisories and regulatory decisions. Its data helps assess local impacts from sources like transportation and industry, and contributes to regional air quality management under the Clean Air Act. The station's long-term operation ensures valuable time-series data for environmental research and policy evaluation.
Environmental context
The Dalles is situated in the Columbia River Gorge, a region influenced by agricultural activities, transportation corridors, and occasional wildfire smoke. Air monitoring at TWL focuses on criteria pollutants to assess compliance with NAAQS and protect sensitive populations. The station's urban location provides representative data for population exposure, while its long-term record supports trend analysis and regulatory reporting under the Clean Air Act.
Frequently asked questions
The station is located at 722 Court Street in The Dalles, Oregon, within Wasco County.
As part of the EPA AQS network, the station typically monitors criteria pollutants including ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide.
The station is operated by the Oregon Department of Environmental Quality (DEQ).
Air monitoring in the US is governed by the Clean Air Act and implemented through the EPA's Air Quality System (AQS). Stations must follow NAAQS for criteria pollutants and use EPA-approved methods for data collection and quality assurance.
The Dalles is in the Columbia River Gorge, where air quality can be affected by agriculture, transportation, and wildfires. Monitoring provides data to protect public health and support regulatory compliance.
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