Air Permitting Assistance
| Request a Pre-Application Meeting
We strongly encourage you to meet with a CT DEEP permit engineer early in your project planning and prior to submitting an air permit application to facilitate the processing of your permit application. A permit engineer will help you identify relevant permitting issues including permitting options, necessary forms, expectations, and timeframes.
Please visit the DEEP Permits and Licenses webpage for more information and how to request one of these helpful meetings.
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General Permitting Support
BACT/LAER Databases
BACT/LAER Review Support
NESCAUM Top-Down BACT Guide (PDF, 1991)
EPA GHG BACT Analysis Guide (PDF, 2010)
Title V Support
Other Helpful Links
CTDEEP Air Technical Support Webpage - Air Modeling and Monitoring Support
CTDEEP Emission Reduction Credits Webpage - Offsets and Trading
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CTDEEP Air Permit Wizard (MS Excel)
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CT BACT Database (.zip, MS Access)
The CT BACT Database allows you to search all recent major source and minor source BACT determinations made in CT to aid in the preparation of a BACT Determination for an application.
NOTE: If you do not have the full version of Microsoft Access 2013 installed on your computer, you can download and install the free Microsoft Office Access 2013 Runtime that will allow you to open and run the database.
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DEEP Air Inventory Radius Search Tool (.zip, MS Access)
The DEEP Air Inventory Radius Search Tool allows you to enter a geographic location (“centroid”) in UTM format, and a radius in kilometers, and retrieve a list of inventoried point sources within that radius to aid in the preparation of a modeling analysis for an application.
The tool was upgraded to version 2.4 in February 2019 and allows the user to select a save location for the MSExcel output. PDF output is no longer generated.
NOTE: If you do not have the full version of Microsoft Access 2013 installed on your computer, you can download and install the free Microsoft Office Access 2013 Runtime that will allow you to open and run the database.
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CTDEEP Engine Emissions Calculator (MS Excel)
CTDEEP calculator for determining criteria air pollutant, greenhouse gas and hazardous air pollutant emissions from stationary reciprocating internal combustion engines using AP-42 emission factors or manufacturer's data. This calculator will also calculate allowable emissions if your emergency engine operates under RCSA 22a-174-3b(e).
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CTDEEP Boiler Emissions Calculator (MS Excel)
CTDEEP calculator for determining criteria pollutant and hazardous air pollutant emissions from boilers using AP-42 emission factors or manufacturer's data.
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CO2 Equivalents Calculator (MS Excel)
CTDEEP calculator for calculating CO2 equivalents for various greenhouse gases (GHGs) using their respective global warming potentials and the expected mass emission rate of those various GHGs from a source.
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CTMASC (MS Excel)
CTDEEP calculator for determining HAP MASC compliance based on the calculation procedures in RCSA Section 22a-174-29. A User Guide is included in the Excel file.
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TANKS v4.09(EPA Website)
TANKS is a Windows-based computer software program, developed by EPA, that estimates VOC and HAP emissions from fixed- and floating-roof storage tanks. TANKS is based on the emission estimation procedures from Chapter 7 EPA's AP-42. A User Guide is available on the Tanks website linked above.
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LandGEM v3.02 (MS Excel)
LandGEM v3.02 User Guide (PDF)
LandGEM is an EPA model which provides a relatively simple approach to estimating landfill gas emissions. LandGEM is based on a first-order decomposition rate equation for quantifying emissions from the decomposition of landfilled waste in MSW landfills.
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If manufacturer’s data or stack test data is not available for your source, you may find relevant emission factors at one of the following sites to aid you in calculating emissions from your source.
WEBFIRE (fast access to EPA emission factors)
State Regulation Links
New Source Performance Standards (NSPS)
40 CFR Part 60 - NSPS (federal regulation)
TCEQ List of NSPS (links to fact sheets, flow diagrams, etc.)
National Emission Standards for Hazardous Air Pollutants (NESHAP)
40 CFR Part 63 - NESHAPs (federal regulation)
TCEQ List of NESHAPs (links to fact sheets, flow diagrams, etc.)
EPA NESHAP Website (EPA contacts for each NESHAP)
Content Last Updated March 12, 2020