Links

US Environmental Protection Agency

• Transportation and Air Quality Home Page

• The Tier 2 Vehicle and Gasoline Sulfur Program 

  
California Air Resources Board

• On-Road New Vehicle & Engine Certification Program

• Off-Road Recreational Vehicles Regulations

• Aftermarket, Performance, and Add-On Parts Regulations

Specialty Equipment Manufacturers' Association (SEMA)

• Home Page

• New Products
   

Society of Automotive Engineers (SAE)

• Home Page

Diesel Net

• Research Labs, Testing and Certification

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