Diesel Emissions Test Experts for The State of Colorado Diesel Emissions Program These counties in the State of Colorado require Diesel Emission Registration and Tests: County of Boulder, County of Jefferson, Broomfield, County of Denver, County of Douglas, Also, Portions of Adams County, Likewise, Portions of Arapahoe County, and Portions of Larimer County, Portions of Weld County Additionally, Portions of Weld County, As well as, Portions of El Paso County
Diesel engines convert the chemical energy contained in the fuel into mechanical power. Diesel fuel is injected under pressure into the engine cylinder where it mixes with air and where the combustion occurs. The exhaust gases which are discharged from the engine contain several constituents that are harmful to human health and to the environment.
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