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

3. 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 http://www.epa.gov/ncea/pdfs/partmatt/Dec2009/PM_ISA_full.pdf

4. 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

5. 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

6. 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

7. 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 14000 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 14000 LB GVWR) All heavy duty vehicles (over 14001 LB GVWR) 7

8. 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

9. Note the Utah license plate! 9

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11. One micron ( µm) is one-millionth of a meter, or 1/1000 of a millimeter – 0.001mm. 1 µm = ~0.000039” Respirable Dust, or Fine Particles which are 2.5 µm and smaller will penetrate into the gas exchange regions of the lungs. 11

12. 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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16. 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

17. Run 11 Numbers represent concentration in liters 17

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

19. 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 0197806000Light Duty Y 01978600114000Medium Duty Y 0197814001999999Heavy Duty Y 1979198908500Light Duty Y 19791989850114000Medium Duty Y 1979198914001999999Heavy Duty Y 1990199508500Light Duty YY 19901995850114000Medium Duty YY 1990199514001999999Heavy Duty YY 1996200108500Light Duty YYY 19962001850114000Medium Duty YY 1996200114001999999Heavy Duty YY 2002200408500Light Duty YY 20022004850114000Medium Duty YY 2002200414001999999Heavy Duty YY 2005200708500Light Duty YYY 20052007850114000Medium Duty YY 2005200714001999999Heavy Duty YY 2008999908500Light Duty YYY 20089999850114000Medium Duty YYY 2008999914001999999Heavy Duty YY 19

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

21. GENERAL INFORMATION: Repair EGR Repair ELECTRICAL Repair EXHAUST Repair IGNITION Repair INTAKE Repair ENGINE Repair PCV/CDRV Repair OTHER 161156062953221480 Top 3 Repairs: Air Filter (61%) Engine Oil/Filter (34%) Fuel Filter (28%) 21

22. 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

23. MISFIRE FUEL COMPONENT NMHC_CAT NOx/SCR BOOST_PRESSURE EXHAUST GAS SENSOR PM FILTER EGR/VVT READY165112811647125574081710089761552 NOT READY 211392291106167410359 23

24. 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

25. 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 - 1995 MY and older 126 vehicles - 1996 MY and newer 126 vehicles - 1996 MY and newer Opacity Measurements: Snap 1 Snap 2 Snap 3 Snap 1 Snap 2 Snap 3 77.7%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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