Why Test Diesels? No SIP Credits EPA Support? Expensive 2 SMOKING TRUCK VIDEO

Diesel Exhaust 3 General Health Concerns: Short- and long-term exposures to PM 2.5 can; Exacerbate Allergic Responses, Decrease immune system efficiency, Cause cardiovascular effects, Cause respiratory effects, Increase mortality. Strong evidence that long-term exposures to PM 2.5 can cause cancer

Diesel Health Effects EPA estimates 11 million diesel vehicles without pollution controls 2.6 million tons NOx 11,000 tons of PM 8,300 premature deaths 17,000 acute bronchitis in kids 360,000 asthma attacks 1.5 million lost work days 7,100 hospital visits 2,400 ER visits Carcinogenic-WHO 4

Davis County Health Assessment High Asthma Highest in Utah/nation High Autism Twice the national average Harvard study High Suicide New U of U study 5

Davis County Pollution NOx and PM 2.5 have been going down every year for the last 10 years while our diesel program has been operating in Davis County. Non-Attainment for PM 2.5 6

Davis County Program OBD The following diesel fueled vehicles may be tested at independent certified testing stations: 1996 and newer light duty vehicles (under 8500 LB GVWR) 2008 and newer medium duty vehicles (8501 LB GVWR to LB GVWR) Opacity Test Diesel fueled vehicles that must be tested at the Technical Center in Kaysville: 1995 and older light duty vehicles (under 8500 LB GVWR) 2007 and older medium duty vehicles (8501 LB GVWR to LB GVWR) All heavy duty vehicles (over LB GVWR) 7

Particulate Matter/Opacity Study Opacity does help identify “dirty”, under maintained vehicles. The majority of the PM measured was PM-2.5 not PM-10 High opacity readings accurately represented high PM emissions 8

Note the Utah license plate! 9

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One micron ( µm) is one-millionth of a meter, or 1/1000 of a millimeter – 0.001mm. 1 µm = ~ ” Respirable Dust, or Fine Particles which are 2.5 µm and smaller will penetrate into the gas exchange regions of the lungs. 11

Based on averaged peak concentration values measured during 9 evaluation runs, a vehicle that fails the Davis County Diesel Opacity inspection will have: 12

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Graph representing Particle Concentration per liter. Peak concentration of over 3 million particles Graph representing Opacity in % and Speed in MPH. Peak Opacity reading was 98% for approximately 0.4 seconds. 16

Run 11 Numbers represent concentration in liters 17

DAVIS COUNTY, UTAH Diesel Vehicle Emissions Inspection/Maintenance Program 18

DAVIS COUNTY, UTAH Diesel Vehicle Emissions Inspection/Maintenance Program WHICH VEHICLES ARE REQUIRED TO BE TESTED AND WHAT TEST PROCEDURES ARE USED? BEGIN MYEND MYSTART GWVREND GWVRDESIGNATIONMIL CHECKOBDGAS CAPFAIL FOR TAMPERSNAP IDLEDYNO Light Duty Y Medium Duty Y Heavy Duty Y Light Duty Y Medium Duty Y Heavy Duty Y Light Duty YY Medium Duty YY Heavy Duty YY Light Duty YYY Medium Duty YY Heavy Duty YY Light Duty YY Medium Duty YY Heavy Duty YY Light Duty YYY Medium Duty YY Heavy Duty YY Light Duty YYY Medium Duty YYY Heavy Duty YY 19

GENERAL INFORMATION: Test numbers and calculations are close approximates Note: Aborted tests are not included 20

GENERAL INFORMATION: Repair EGR Repair ELECTRICAL Repair EXHAUST Repair IGNITION Repair INTAKE Repair ENGINE Repair PCV/CDRV Repair OTHER Top 3 Repairs: Air Filter (61%) Engine Oil/Filter (34%) Fuel Filter (28%) 21

17% No Pass Rate For Vehicles MY 2008 and Newer, 8,501 – 14,000 GVWR: For Light-Duty Vehicles MY 1996 and Newer: 14% No Pass Rate 22

MISFIRE FUEL COMPONENT NMHC_CAT NOx/SCR BOOST_PRESSURE EXHAUST GAS SENSOR PM FILTER EGR/VVT READY NOT READY

A FEW OPACITY TEST RELATED STATISTICS: Cutpoint of 20% opacity 16.4% Initial Fail rate Vehicles: 1968 – 2007 MY 8,501 – 14,000 GVWR 24

AND A FEW MORE OPACITY RELATED STATISTICS: 1995 MY and older - Cutpoint of 40% opacity 1996 MY and newer – Cutpoint of 20% opacity Vehicle break-out: 42 vehicles MY and older 126 vehicles MY and newer 126 vehicles MY and newer Opacity Measurements: Snap 1 Snap 2 Snap 3 Snap 1 Snap 2 Snap %81.4%87.2% 50.8%45.5%40.4%  Initial Failing Snap Tests (7%) Vehicles: 1968 & Newer MY >14,000 GVWR 25

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