Overview
Cortina Indian Rancheria Air Monitoring Station in Williams, California, is an operational air quality monitoring site managed by the Cortina Indian Rancheria of Wintun Indians, providing data as of September 2025.
Cortina Indian Rancheria Air Monitoring Station is an operational air quality monitoring facility located on the Cortina Indian Rancheria in Colusa County, California, near the town of Williams. It is managed by the Cortina Indian Rancheria of Wintun Indians, a federally recognized tribe, and contributes to ambient air quality surveillance in the region. The station operates under the regulatory framework of the U.S. Environmental Protection Agency's Air Quality System (AQS), which sets standards for criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. While specific parameters measured are not detailed, typical tribal air monitoring stations focus on particulate matter (PM2.5 and PM10) and ozone, often using federal reference methods or continuous monitors. The station's last reported sample date is September 30, 2025, indicating recent and ongoing data collection. This monitoring station serves the Cortina Indian Rancheria community and surrounding areas, supporting environmental health assessments and compliance with the Clean Air Act. Its location in a rural agricultural region of California's Sacramento Valley provides valuable baseline data away from major urban centers, aiding in understanding regional air quality trends and potential impacts from agricultural activities and wildfires.
Environmental context
The Cortina Indian Rancheria is situated in the Sacramento Valley, a region with a Mediterranean climate characterized by hot, dry summers and mild, wet winters. Air quality in this area can be influenced by agricultural emissions (e.g., dust, pesticides), seasonal wildfires, and transport of pollutants from the San Francisco Bay Area and Central Valley. The monitoring station's siting in a rural tribal community provides representative data for assessing background air quality and potential exposure risks for sensitive populations, including children and the elderly. Parameter coverage typically includes criteria pollutants, with an emphasis on particulate matter and ozone, which are of concern in California's inland valleys.
Frequently asked questions
The station is located on the Cortina Indian Rancheria in Colusa County, California, near the town of Williams, at the address CORTINA INDIAN RANCHERIA, SPRING VALLEY RD, WILLIAMS.
While specific parameters are not publicly listed, typical tribal air monitoring stations in California measure criteria pollutants such as particulate matter (PM2.5 and PM10) and ozone, in accordance with EPA AQS standards.
The station is operated by the Cortina Indian Rancheria of Wintun Indians, a federally recognized tribe, as part of their environmental monitoring program.
The station operates under the U.S. Environmental Protection Agency's Air Quality System (AQS) network, which implements the Clean Air Act and National Ambient Air Quality Standards (NAAQS) for criteria pollutants.
Air monitoring on tribal lands helps protect the health of tribal communities by tracking pollutants from nearby agricultural, industrial, and wildfire sources, and supports compliance with federal air quality standards.
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