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The Northwest Clean Air Agency takes an active role in making information available to the public. Please browse through our offered resources below including publications, projects and regulations.

Looking for more information?


Projects and Resources

  • Sulfur Dioxide (SO2) emissions at Intalco

    NWCAA is working with the Washington Department of Ecology, the U.S. Environmental Protection Agency, and various stakeholders to bring sulfur dioxide emissions from Alcoa’s Intalco aluminum smelter in Whatcom County in line with national air quality standards.

  • Greenhouse Gas Reduction

    We are committed to supporting and carrying out local, state, and federal policies and efforts to curb the human contribution of greenhouse gases to the environment. As part of those efforts, we are investing $4.7 million in local environmental projects.

  • Indoor Air Quality

    Compiled information and tips into this online resource to help you keep your indoor air clean and healthy.

  • Columbia Valley Air Quality Improvement Project in Whatcom County

    We are active participants in this community-led effort to improve air quality by reducing wood smoke in the Columbia Valley urban growth area of Whatcom County.


Click on the Regulation Sections to view PDFs of those sections. A link to a downloadable PDF version of the complete NWCAA Regulation is available on the bottom right. Refer to this official, legal version of the regulation in case of a discrepancy with website postings.

  • Section 400:

    Ambient Air Standards

  • Section 502 - 540:

    Regulated Activities and Prohibitions

  • Section 550 - 590:

    Regulated Activities and Prohibitions

  • Section 600:

    Objectives and Planning Criteria

  • Appendix:

    Appendix A: Ambient Monitoring, Emission Testing, And Continuous Emission and Opacity Monitoring

NWCAA Regulation