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  • Nine States That Require Diesel Emissions Tests

Nine States That Require Diesel Emissions Tests

Law Of The Land

Mike McGlothlin
Jun 1, 2010
In light of California's new diesel emissions laws, which went into effect January 1, 2010, we took a closer look at the country as a whole to find out exactly which states are testing light-duty diesel vehicles with gross vehicle weight ratings (GVWR) up to 14,000 pounds. What we discovered was that every state conducting tests on diesel pickups is only doing so in select counties, or highly populated areas (except Connecticut, which tests statewide). We agree with this practice because in densely populated areas there are bound to be more commuters, and ultimately more pollution. Here is a list of all states currently conducting diesel emissions testing.
Connecticut
Counties: All
Vehicles Tested: All model years more than four years old with a 10,000-pound GVWR or less
Test Type(s): Smoke opacity (snap-idle procedure with no load on engine)
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Colorado
Counties: Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, and Jefferson
Vehicles Tested: All model years with a 14,000-pound GVWR or less (new vehicles are exempt for first four years)
Test Type(s): Visual inspection for emissions-equipment tampering, onboard diagnostics (OBD-II) check (if applicable), and a smoke opacity test
Photo 3/10   |   diesel Power diesel Emissions Testing States colorado State
Arizona
County: Maricopa
Vehicles Tested: Any model year with an 8,501-pound GVWR or greater
Test Type(s): Smoke opacity (the vehicle makes three wide-open-throttle, non-loaded runs with the transmission in neutral)



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California
Counties: 40 of 58 (high population areas)
Vehicles Tested: '98-and-newer with a 14,000-pound GVWR or less
Test Type(s): Visual inspection for emissions-equipment tampering, onboard diagnostics (OBD-II) check, smoke opacity test (snap-idle procedure with no load on engine)




Photo 5/10   |   diesel Power diesel Emissions Testing States california State
New York
Counties: Nassau, Rockland, Suffolk, and Westchester (New York City metropolitan area)
Vehicles Tested: All model years with more than an 8,501-pound GVWR
Test Type(s): Visual inspection for emissions-equipment tampering, onboard diagnostics (OBD-II) check (if applicable), and a smoke opacity test
Photo 6/10   |   diesel Power diesel Emissions Testing States new York State
Nevada
Counties: Clark and Washoe
Vehicles Tested: All model years with a 14,000-pound GVWR or less
Test Type(s): Visual inspection for emissions-equipment tampering, and a smoke opacity test using a dyno to create a load



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Utah
Counties: Davis, Salt Lake, Utah, and Weber
Vehicles Tested: All model years with a 14,000-pound GVWR or less
Test Type(s): Visual inspection for emissions-equipment tampering, and a smoke opacity test




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Wisconsin
Counties: Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, and Waukesha
Vehicles Tested: '07-and-newer models between 8,501 pounds and 14,000 pounds GVWR (dedicated farm vehicles are exempt)
Test Type(s): Onboard diagnostics (OBD-II) check


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Tennessee
Counties: Davidson, Hamilton, Rutherford, Sumner, Williamson, and Wilson
Vehicles Tested: All model years with a 10,500-pound GVWR or less
Test Type(s): Smoke opacity, and onboard diagnostics (OBD-II) check (if applicable)
Photo 10/10   |   diesel Power diesel Emissions Testing States tennessee State

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