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AirPermitHub

ME · EPA Region 1

Maine Air Permits

Maine issues air emission licenses. Minor sources and new source review (new equipment or modifications) are licensed under Chapter 115; major sources also need a Part 70 (Title V) license under Chapter 140. All of Maine is in the Ozone Transport Region, which lowers the VOC major source threshold (see the permit entries). New sources and minor and major modifications require a BACT analysis. General permits cover rock crushers and concrete batch plants.
Verified against agency sourceLast reviewed 2026-10-25

Air permits & authorizations

  • General Permits

    General Permit

    Rock Crusher General Permit and Concrete Batch Plant General Permit.

    Official page

  • Chapter 115 Minor Source Air Emission License

    Minor NSR

    License for minor sources and for new equipment or modifications (new source review). BACT analysis required for new sources and minor and major modifications. Synthetic minor status is available by taking federally enforceable limits or caps.

    Thresholds (summarized from source, not a quotation)

    Per DEP: minor sources have potential to emit below 50 tpy VOC (Ozone Transport Region), 10 tpy any single HAP, 25 tpy combined HAPs, and 100 tpy of any other regulated pollutant.

    06-096 CMR Chapter 115Official page

Major NSR (PSD & nonattainment)

  • Chapter 115 Major New Source / Major Modification

    PSD

    Major new sources and major modifications are licensed under Chapter 115 with additional public notice (Notice of Draft License Availability) and major source application guidance.

    06-096 CMR Chapter 115Official page

Title V operating permits

  • Part 70 (Title V) Air Emission License

    Title V

    Required for major sources in addition to Chapter 115 licensing; separate forms for initial/renewal, modifications, and transfers.

    Thresholds (summarized from source, not a quotation)

    Per DEP: 50 tpy VOC (Ozone Transport Region); 10 tpy single HAP; 25 tpy combined HAPs; 100 tpy any other regulated pollutant.

    06-096 CMR Chapter 140Official page

Oil & Gas

Maine has no oil and gas production. DEP's permitting pages list no oil-and-gas-specific air program.

    Oil & Gas industry hub

    State air regulations

    Forms

    Guidance

    Compliance

    State compliance obligations (reporting, emissions inventory, testing) are being indexed. Use the Compliance dashboard preview to see how they will be tracked.

    Sources

    Editorial note: Chapter titles are summarized; confirm on the Secretary of State DEP rules page. Exemption thresholds for minor sources were not stated on the pages reviewed.

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