An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

EPA Regulation Navigation Tools

NOTE: EPA is currently updating the Regulation Navigation tools due to the loss of the functionality of Adobe Flash Player. New versions will be available soon.

Regulation Navigation (Reg Nav) tools help owners and operators of facilities in certain industries determine the requirements of specific air quality regulations.  Reg Nav tools are online and interactive, and use the information entered to assess potential regulatory requirements. 

Reg Nav tools do not store or save information, so you must print or save any output that you want to use or reference. Note that the Reg Nav requirements may not be complete. Refer any questions to your local authority.

Air Pollutant Category Regulation Reg Nav Tool
National Emissions Standards for Hazardous Air Pollutants under 40 CFR part 63 Subpart LLL Portland Cement Manufacturing Industry
  Subpart ZZZZ Reciprocating Internal Combustion Engines (RICE)
  Subpart JJJJJ Brick and Structural Clay Products Manufacturing
  Subpart HHHHHH Paint Stripping and Miscellaneous Surface Coating Operations at Area Sources: determining exemption eligibility
  Subpart JJJJJJ Area Source Industrial, Commercial, and Institutional Boilers
New Source Performance Standards Subpart WWW Municipal Solid Waste Landfills
  Subpart XXX Municipal Solid Waste Landfills That Commenced Construction, Reconstruction, or Modification After July 17, 2014
  Subpart IIII & Subpart JJJJ (one tool)  Stationary Compression Ignition Internal Combustion Engines and Spark Ignition Internal Combustion Engines
Emissions Guidelines Subpart Cc Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills: Subpart Cc
  Subpart Cf Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills: Subpart Cf

If you are having difficulties opening Reg Nav in one internet browser, it may work in a different browser.

More information on these EPA regulations and other stationary sources of air pollution.