Yreka Air Monitoring Station, California | United States Environmental Monitoring

Yreka is an operational air monitoring station located at 530 Foothill Drive in Yreka, California, within Siskiyou County. It is part of the California Air Resources Board's monitoring network, contributing to the US EPA Air Quality System (AQS) that tracks criteria pollutants across the United States. The station's last reported sample date was December 31, 2024, indicating ongoing data collection. As an air monitoring station, Yreka typically measures criteria pollutants such as ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide, in line with the National Ambient Air Quality Standards (NAAQS). The station's siting follows EPA guidelines to ensure representativeness of local air quality, supporting regulatory compliance and public health assessments in the region. The station serves the community of Yreka and surrounding areas by providing essential data for air quality management and research. Its location in Siskiyou County, near the Oregon border, helps monitor regional air quality trends, including impacts from wildfires and agricultural activities. This data supports state and federal efforts to protect public health and the environment.

Yreka's air monitoring station operates within California's stringent air quality regulatory framework, which includes the California Air Resources Board's oversight and the US EPA's AQS network. The station's parameter coverage likely includes criteria pollutants and possibly meteorological data, supporting local and regional air quality assessments. Siting representativeness is critical for capturing urban and rural influences, given Yreka's location in a valley near the Klamath Mountains.