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Clean Air Act Nonroad Engine and Vehicle Authorizations. Section 209(e)(1) of the CAA prohibits states and local governments from adopting or attempting to enforce any standard or requirement relating to the control of emissions from certain new nonroad vehicles or engines.

The Tier 4 standards require that emissions of PM and NOx be further reduced by about 90%. These emission reductions have been achieved through the use of advanced exhaust gas aftertreatment technologies, with most Tier 4 engine families using urea-SCR catalysts for NOx control.

Nonroad engine has the meaning we give in 40 CFR 1068.30. In general this means all internal-combustion engines except motor vehicle engines, stationary engines, engines used solely for competition, or engines used in aircraft.

non-road diesel engines (machinery) in construction and agricultural equipment such as backhoes and tractors. Other equipment are included such as ground support equipment, and heavy forklifts, generators and pumps that use diesel engines. marine diesel engine. locomotive.

Nonroad engine has the meaning we give in 40 CFR 1068.30. In general this means all internal-combustion engines except motor vehicle engines, stationary engines, engines used solely for competition, or engines used in aircraft.