This application is temporarily down for emergency maintenance. We apologize for the inconvenience.
CATS will be unavailable on April 30 th due to scheduled maintenance. It is anticipated that these applications will be unavailable from 2:00pm until 6:00pm. We apologize for the inconvenience.
CATS will be unavailable on Saturday, February 6 th , beginning at 10 AM until 3:00 PM. Sorry for any inconvenience.
Our Clean Air Tracking System (CATS) allows users to process new applications, renewals, amendments and all other air permit related actions. If you are already registered, Login to CATS.
New applicants must register for an account. To get started:
Users can also conduct an Air Permit Information search for a property.
Filing Instructions for Fossil Fuel Burning Boilers and Water Heaters
If a new Boiler Registration II application is not submitted by a registered Professional Engineer, then the PE Certification Letter for CATS filing is required
Boiler Forms and Documents
As of August 1, 2017, DEP will no longer accept new equipment acceptance applications. Download the Equipment Approval Directive.
A Boiler and Burner Compliance Certification is submitted by the filling PE to certify equipment (bare boiler, burner, assemblies, custom installation and control) not accepted by DEP will comply with all applicable regulations.
Draft calculations are required for a new boiler, induced draft fan or chimney and in accordance with the procedures in 2009 ASHRAE Fundamentals Chapter 21 and 2012 ASHRAE Systems and Equipment Chapter 35.
All boilers that are equal to or greater than 2.8 million Btu/hr must have annual tune-ups and records of the tune-up using these forms must be retained for a minimum of 5 years.
Owners need to provide a Letter of Authorization when changing a Professional Engineer, Registered Architect or Installer.
Installer must submit the Installer Statement when the installer is not named on the Work Permit Application form or the owner changed the Installer.
Fuel Equivalency Form
Filing Instructions for Industrial Processes and Generators
If you require require assistance in determining which application process you should follow, please download and submit an Industrial Process Questionnaire.
For procedures for filing a registration for:
Solid Fuel Registration is required in order for DEP to conduct a Smoke and Odor Inspection. Once an application is approved, DEP will reach out to schedule an inspection.
For procedures for filing a Gas Station Registration, download the Gas Station Registration.
For Procedures for filing a generator, engine or other combustion source registration, download the Combustion Registration.
For filing requirements for engines and generators, download Engines, Generators, Turbines Determination of NYC DEP Filing Requirements. Units below the listed thresholds do not need to be filed.
Method 9 Opacity Certification is required for all generators regardless of their EPA Tier. This form should be completed and attached with an Inspection Request for original and triennial renewals through CATS. First time filing of EPA Tier 4 or equivalent generators do not need an opacity certification. Generators permitted as a registration must conduct an opacity test but do not need to submit the results to DEP.
Learn procedures for filing an Inspection Request (Original and Renewal) to obtain a Certificate of Operation.
The Demolition Registration Form Package AR299 & AR300 is available for download in: English, Español, 简体中文, русский, Kreyòl ayisyen, 한국어, বাংলা, Polski, العربية , Français, اردو .
