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Air Resources and Publications
Opportunity for public comments.
Guidance Documents
- Licensing Acronyms (pdf) - A list of acronyms/abbreviations that may be used in processing Air Emissions Licenses.
- NESCAUM BACT Guidance (pdf) - Guidance for determining BACT from the Northeast States for Coordinated Air Use Management (NESCAUM)
- State of Maine BACT Guidance (pdf) - Summary of general requirements when preparing a BACT analysis for the Maine DEP
- Construction Guidance (pdf) – Information on what construction activities may take place prior to issuance of an air emission license.
- Reminder to Obtain an Air Emission License Prior to Beginning Construction of a New or Modified Source (pdf) – Memo dated July 29, 2024
- Changes to 38 MRSA §603-A (pdf) - Guidance regarding changes to sulfur content in fuel oil
- Distillate Fuel Transition (pdf) - Guidance for storage terminals and distribution facilities regarding the transition to 15 ppm distillate fuel.
- NMMPP FAQ (pdf) - Frequently Asked Questions about Nonmetallic Mineral Processing Plants (Rock Crushers)
- Temporary Insignificant Activities (pdf) - Guidance on what equipment is eligible to be considered a temporary insignificant activity and the process for requesting approval
- Clean Air Act Section 176A Petition (pdf) – Frequently Asked Questions about implementation of Maine’s approved Clean Air Act Section 176A Petition
Guidance Specific to Engines
- Inclusion in Applications (pdf) - When to include portable engines in Air Emission License applications.
- Modeling Guidance (pdf) - When to exempt stationary internal combustion engines from a modeling analysis if used for maintenance, stand-by, or emergency use.
- QAISA Guidance (pdf) - When and how to submit a Qualitative Ambient Impact Screening Analysis (QAISA) pursuant to Chapter 169.
- Very Small Engine (pdf)s - Guidance on requirements for stationary engines smaller than licensing thresholds
- Mineral Processing Industry Engines (pdf) – Article on the difference between stationary and portable engines.
Additional Compliance Resources are available on our Air Compliance webpage.
Reports
- Air Emissions Inventory Data - Maine DEP provides summaries of criteria air pollutant and greenhouse gas emissions inventories, as well as other inventory products, through its FTP site. Please view the readme.txt file for a full description of available information.
- Annual Air Monitoring Plan
- Five Year Assessment of Ambient Air Monitoring Network (pdf)
- Department Reports