District monitors for ozone and particulate matter, as mandated by the State and Local Air Monitoring System (SLAMS), as well as acid rain. The District operates and maintains all monitoring equipment.
Acid Rain: The District has one rain gauge and precipitation collector located near the Siskiyou County Airport. A new collection bucket is installed every Tuesday. Precipitation samples are sent to the National Atmospheric Deposition Program National Trends Network (NADP/NTN) for analysis and reporting.
Ozone: The Yreka monitor continuously analyzes and records ambient ground-level ozone concentrations. Data is checked for errors, processed, and reported to the California Air Resources Board (CARB) quarterly. Precision checks are made and recorded regularly to insure data integrity.
Particulates: Particulate matter less than 2.5 microns (PM2.5) in diameter is monitored in Yreka. Once every six-days the District exposes pre-conditioned filters for 24-hours and returns the filters to the CARB PM analysis laboratory to calculate particulate mass concentrations and report to the Environmental Protection Agency (EPA). A continuous PM2.5 monitor in Yreka is under development that will eventually replace the 1-in-6 day monitor.