Overview
Coso Junction is an air monitoring station in Inyo County, California, operated by the Great Basin Unified APCD. It provides ambient air quality data for the remote Owens Valley region.
Coso Junction is an air monitoring station located at the Coso Junction Rest Area along Highway 395 in Inyo County, California. Operated by the Great Basin Unified Air Pollution Control District (APCD), this station is part of a regional network that monitors air quality in the eastern Sierra Nevada and Owens Valley areas. As a rural monitoring site, it contributes to understanding background pollutant levels and long-range transport impacts. The station operates under the regulatory framework of the U.S. EPA's Ambient Air Quality Monitoring program, which sets standards for criteria pollutants such as ozone, particulate matter, and nitrogen dioxide. While specific parameters measured at Coso Junction are not detailed, typical rural stations in California monitor ozone and PM2.5 to assess compliance with National Ambient Air Quality Standards (NAAQS). The Great Basin Unified APCD coordinates with the California Air Resources Board to ensure data quality and reporting continuity. This monitoring station serves a sparsely populated region with significant geographic and climatic diversity, from the Sierra Nevada mountains to the Mojave Desert. Data from Coso Junction helps characterize air quality in areas affected by wildfires, dust storms, and transported pollution from urban centers. The station's location along a major highway also provides insights into traffic-related emissions in a remote setting. Its operational status as of mid-2025 indicates ongoing contributions to the national air quality database.
Environmental context
The Coso Junction area lies in the Owens Valley, a high desert region with unique meteorological conditions that can trap pollutants. Local air quality is influenced by dust from dry lakebeds, wildfire smoke, and transported emissions from the Los Angeles basin. Monitoring at this site helps track background ozone levels and particulate matter, which are critical for understanding regional air quality trends and compliance with EPA standards. The station's remote siting provides representative data for rural areas, complementing urban monitoring networks.
Frequently asked questions
Coso Junction is located at the Coso Junction Rest Area along Highway 395 in Inyo County, California, in the Owens Valley region.
The station is operated by the Great Basin Unified Air Pollution Control District (APCD), which manages air quality monitoring in the eastern Sierra Nevada and Owens Valley areas.
Typical rural air monitoring stations in California measure ozone and fine particulate matter (PM2.5) to assess compliance with National Ambient Air Quality Standards.
Data from Coso Junction supports the U.S. EPA's Ambient Air Quality Monitoring program, helping to track background pollutant levels and inform regulatory decisions for the region.
The Great Basin Unified APCD is a local air district responsible for monitoring and regulating air quality in Alpine, Inyo, and Mono counties in California, focusing on areas like the Owens Valley and Mammoth Lakes.
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