Appendix 8: Tables showing Total Vehicles Tested and Exempt by Vehicle Class

Total Vehicles tested and exempt by Vehicle Class

1) All light-duty non-diesel vehicles model year 1996 or newer

Class Weight range fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt

LDGV <=6,000 lbs. 1,972,215 1,749,683 88.7% 222,532 11.3% 1,804,081 1,644,765 91.2% 159,316 8.8% 1,591,466 1,450,926 91.2% 140,540 8.8%

LDGT12 <=8,500 lbs 1,745,545 1,615,595 92.6% 129,950 7.4% 1,868,112 1,754,989 93.9% 113,123 6.1% 2,020,759 1,898,393 93.9% 122,367 6.1%

LDGT34 <=8,500 lbs 617,808 572,684 92.7% 45,125 7.3% 661,189 617,927 93.5% 43,262 6.5% 715,216 668,419 93.5% 46,797 6.5%

Totals 4,335,569 3,937,962 90.8% 397,607 9.2% 4,333,381 4,017,681 92.7% 315,701 7.3% 4,327,441 4,017,738 92.8% 309,703 7.2%

2) All light-duty diesel vehicles model year 1997 or newer

Class Weight range fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt

LDDV <=6,000 lbs. 4,780 2,331 48.8% 2,449 51.2% 4,373 2,202 50.4% 2,171 49.6% 3,858 2,067 53.6% 1,790 46.4%

LDDT12 <=8,500 lbs 2,173 1,284 59.1% 889 40.9% 2,326 1,422 61.1% 904 38.9% 2,516 1,583 62.9% 933 37.1%

LDDT34 <=8,500 lbs 5,140 3,895 75.8% 1,245 24.2% 5,501 4,303 78.2% 1,198 21.8% 5,951 4,751 79.8% 1,199 20.2%

Totals 12,094 7,510 62.1% 4,584 37.9% 12,200 7,927 65.0% 4,273 35.0% 12,324 8,402 68.2% 3,922 31.8%

3) All medium-duty diesel vehicles model year 2007 or newer

Class Weight range fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt

HDDV2B >8.5k and <=10k 34,235 9,225 26.9% 25,010 73.1% 34,448 18,800 54.6% 15,648 45.4% 35,042 30,538 87.1% 4,504 12.9%

HDDV3 >10k and <=14k 5,631 1,342 23.8% 4,289 76.2% 5,666 2,918 51.5% 2,748 48.5% 5,764 4,977 86.3% 787 13.7%

Totals 39,866 10,567 26.5% 29,299 73.5% 40,114 21,718 54.1% 18,396 45.9% 40,806 35,515 87.0% 5,291 13.0%

4) All medium-duty non-diesel vehicles model year 2008 or newer

Class Weight range fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt

HDGV2B >8.5k and <=10k 133,915 27,953 20.9% 105,962 79.1% 134,747 69,743 51.8% 65,004 48.2% 137,072 114,534 83.6% 22,538 16.4%

HDGV3 >10k and <=14k 9,250 1,413 15.3% 7,837 84.7% 9,308 3,377 36.3% 5,931 63.7% 9,468 6,286 66.4% 3,182 33.6%

Totals 143,165 29,366 20.5% 113,799 79.5% 144,055 73,120 50.8% 70,935 49.2% 146,540 120,821 82.4% 25,720 17.6%

5) All heavy-duty diesel and non-diesel vehicles equipped with OBD systems. 

Class Weight range fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt fleet total # tested % tested # exempt % exempt

HDV4 >14k and <=16k 11,021 - 0.0% 11,021 100.0% 11,089 - 0.0% 11,089 100.0% 11,280 5,654 50.1% 5,627 49.9%

HDV5 >16k and <=19.5k 9,814 - 0.0% 9,814 100.0% 9,875 - 0.0% 9,875 100.0% 10,045 5,145 51.2% 4,900 48.8%

HDV6 >19.5k and <=26k 30,661 - 0.0% 30,661 100.0% 30,852 - 0.0% 30,852 100.0% 31,384 14,194 45.2% 17,191 54.8%

HDV7 >26k and <=33k 32,312 - 0.0% 32,312 100.0% 32,513 - 0.0% 32,513 100.0% 33,074 14,149 42.8% 18,926 57.2%

HDV8A >33k and <=60k 16,607 - 0.0% 16,607 100.0% 16,710 - 0.0% 16,710 100.0% 16,998 4,461 26.2% 12,537 73.8%

HDV8B >60k 38,299 - 0.0% 38,299 100.0% 38,537 - 0.0% 38,537 100.0% 39,202 14,783 37.7% 24,418 62.3%

HBBS School Bus 11,651 - 0.0% 11,651 100.0% 11,723 - 0.0% 11,723 100.0% 11,925 6,295 52.8% 5,630 47.2%

HDBT Transit Bus 1,573 - 0.0% 1,573 100.0% 1,583 - 0.0% 1,583 100.0% 1,610 761 47.3% 849 52.7%

Totals 151,937 - 0.0% 151,937 100.0% 152,881 - 0.0% 152,881 100.0% 155,520 65,443 42.1% 90,077 57.9%

Totals all classes 4,682,632 3,985,405 85% 697,226 15% 4,682,632 4,120,446 88% 562,185 12% 4,682,632 4,247,918 91% 434,714 9%

* includes 15 year old model exemption

2018 (MY 2007 and newer OBD tested) *

The number of vehicles subject to emissions testing is is derived using the MOBILE6 default fleet distribution fractions applied to 2004 Massachusetts vehicle fleet data, and using 2004 Massachusetts 

registration age and diesel sales fractions to determine the non-diesel and diesel information for each class. 

2009 (MY 2013 and newer OBD tested) 2012 (MY 2013 and newer OBD tested) * 2018 (MY 2013 and newer OBD tested) *

2009 (MY 1996 and newer OBD tested) 2012 (MY 1998 and newer OBD tested) * 2018 (MY 2004 and newer OBD tested) *

2009 (MY 2008 and newer OBD tested) 2012 (MY 2008 and newer OBD tested) * 2018 (MY 2008 and newer OBD tested) *

2009 (MY 2008 and newer OBD tested) 2012 (MY 1998 and newer OBD tested) * 2018 (MY 2004 and newer OBD tested) *

2009 (MY 2007 and newer OBD tested) 2012 (MY 2007 and newer OBD tested) *

MA SIP Revision, 310 CMR 60.02, the Massachusetts Motor Vehicle Emissions Inspection and Maintenance Program

Documentation of IM SIP Revision consistent with 42 USC Section 7511a and Section 182 (c)(3)(A) of the Clean Air Act