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Air Quality Historical Data

The District operates four air monitoring stations within its tri-county jurisdiction of Humboldt, Del Norte and Trinity counties:

Del Norte County:

  • Crescent City Station

Humboldt County:

  • Jacobs Station
  • Humboldt Hill Station

Trinity County:

  • Weaverville Station

Data collected at these stations is reported to the EPA for determining compliance with the Federal Ambient Air Quality Standards. The District regularly provides a status and overview of current air monitoring activities to its Governing Board meetings and through the State's AQMIS Database website (see below).

The District's historical air monitoring data is most easily accessed through the California Air Resources Board (CARB) databases:
iADAM Database: iADAM Database Guide; iADAM website
AQMIS Database: AQMIS Database Guide; AQMIS website
(Click here for District's suggested guidance to obtain air data from AQMIS site.)