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The interactive, online Regulation Navigation tools allow owners, operators, and other industry personnel to generally determine the applicability and regulatory requirements of certain air quality rules to their facilities.


For complex Clean Air Act rules,the regulated community and government agencies require assistance in understanding specific rule applicability and requirements. The Regulation Navigation (Reg Nav) tools provide an interactive, online process that involves answering a series of questions to arrive at a personalized document outlining the regulatory requirements for a given facility.


  • Simplifies and encourages compliance with Clean Air Act § 105 Regulations
  • Reduces compliance assistance requests to government agencies
  • Designed for use by regulated community, states, and tribal governments


  • The first suite of Reg Nav tools was launched in 2012 and based on existing air quality regulation flowcharts created by the Texas Commission on Environmental Quality.
  • Four tools have been created for five different air quality regulations, namely:
    • National Emissions Standards for Hazardous Air Pollutants:
      • Subpart LLL: Portland Cement Manufacturing Industry
      • Subpart ZZZZ: Reciprocating Internal Combustion Engines
      • Subpart JJJJJ: Brick and Structural Clay Products Manufacturing
    • New Source Performance Standards Subpart IIII & Subpart JJJJ (one tool): Stationary Compression Ignition Internal Combustion Engines and Spark Ignition Internal Combustion Engines
  • The team conducts ongoing coordination with states including Texas, Nebraska, and Michigan;local and tribal agencies; and trade associations representing the cement, brick, and other manufacturing industries.
  • The Reg Nav tools can be accessed at


  • A New tool for NSPS Subpart WWW: Municipal Solid Waste Landfills is nearly complete and expected to be released in late 2019.
  • With assistance from the Environmental Council of the States, the project team is coordinating internally and with E-Enterprise Partner agencies to maintain a list of priority regulations to add to the Reg Nav suite of tools.