Overview
GRAND JUNCTION - POWELL BLDG is an operational air monitoring station in Grand Junction, Colorado, managed by the Colorado Department of Public Health and Environment. It contributes to the US EPA Air Quality System network.
GRAND JUNCTION - POWELL BLDG is an air monitoring station located at 650 South Ave. in Grand Junction, Colorado, within Mesa County. Operated by the Colorado Department of Public Health and Environment, it is part of the national network of ambient air quality monitors that support the US EPA's Air Quality System (AQS). The station provides critical data on criteria pollutants to assess regional air quality and protect public health. The station operates under the regulatory framework of the Clean Air Act and the National Ambient Air Quality Standards (NAAQS). As a fixed-site monitor in a semi-arid intermountain region, it likely measures pollutants such as ozone, particulate matter (PM2.5 and PM10), and possibly nitrogen dioxide. The Colorado Department of Public Health and Environment ensures data quality and reporting continuity, with the most recent sample date recorded in August 2025. This monitoring station serves the Grand Junction metropolitan area, a region with a mix of urban, agricultural, and industrial sources. Its location near the Colorado River valley and the Book Cliffs provides representative data for the Western Slope of Colorado. The station's data supports air quality management, health advisories, and compliance with federal standards, contributing to the broader goal of protecting environmental and community health.
Environmental context
The Grand Junction area experiences a semi-arid climate with frequent temperature inversions that can trap pollutants near the surface, making air quality monitoring essential. The station's siting near urban and transportation corridors captures emissions from vehicles, industry, and residential sources. Parameter coverage typically includes criteria pollutants like ozone and particulate matter, which are of concern due to local geography and population exposure. Reporting continuity through the Colorado Department of Public Health and Environment ensures data is integrated into the EPA AQS network for regulatory compliance and public reporting.
Frequently asked questions
The station is located at 650 South Ave. in Grand Junction, Colorado, within Mesa County, United States.
As an air monitoring station, it measures ambient concentrations of criteria air pollutants such as ozone, particulate matter (PM2.5 and PM10), and other pollutants as part of the US EPA Air Quality System network.
The station is operated by the Colorado Department of Public Health and Environment, which is responsible for data collection, quality assurance, and reporting to the US EPA.
The station operates under the US Clean Air Act and the National Ambient Air Quality Standards (NAAQS), with data submitted to the EPA's Air Quality System (AQS) for compliance and public reporting.
Grand Junction's semi-arid climate and valley location can lead to temperature inversions that trap pollutants. Monitoring helps protect public health, assess compliance with air quality standards, and inform local air management strategies.
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