Air Quality Monitoring
District operates four air monitoring stations within its tri-county jurisdiction: Jacobs Station (Humboldt County),
Humboldt Hill Station (Humboldt County), Crescent City (Del Norte County), and Weaverville Station (Trinity County). Air
monitoring data collected at these stations is reported to the EPA for determining compliance with the Federal
Ambient Air Quality Standards.
monitoring stations are typically small buildings which contain sampling and monitoring equipment. They are usually
accompanied by a meteorological station to measure wind speed, direction, temperature, and humidity. Meteorological
information is collected to assist in determining the origin of pollution events and is used when preparing healthrisk
Jacobs Station, Eureka
California Air Resources Board (CARB) conducts routine audits of District equipment and procedures for quality
assurance purposes. The most recent local air quality data
from each of the District's monitoring stations. If you would like more information that what is provided on this
website please contact District staff.