1. A. Idle Exhaust Emissions Test.

   1. (1) A vehicle shall fail if sample dilution occurs.

   2. (2) Hydrocarbon (HC) and carbon monoxide (CO) emissions may not exceed the following values:

      1. (a) Table 2. Gross vehicle weight greater than 8,500 pounds but less than or equal to 10,000 pounds.

         	Vehicle Model Year	HC (parts per million)	CO (percent)
         (i)	1977	580	7.00
         (ii)	1978	550	6.70
         (iii)	1979	470	5.00
         (iv)	1980	350	5.00
         (v)	1981	250	3.00
         (vi)	1982	220	2.50
         (vii)	1983	220	1.50
         (viii)	1984—1990	220	1.20
         (ix)	1991—1992	200	1.00
         (x)	1993—1995	175	1.00
         (xi)	1996—2000	125	1.00
         (xii)	2001 and newer	100	0.75

      2. (b) Table 3. Gross vehicle weight greater than 10,000 pounds:

         	Vehicle Model Year	HC (parts per million)	CO (percent)
         (i)	1977	650	7.00
         (ii)	1978	650	7.00
         (iii)	1979	650	6.50
         (iv)	1980	500	6.00
         (v)	1981	500	6.00
         (vi)	1982	500	6.00
         (vii)	1983	500	3.50
         (viii)	1984—1985	440	3.00
         (ix)	1986	280	2.50
         (x)	1987—1992	220	1.20
         (xi)	1993—1995	200	1.00
         (xii)	1996—2000	125	1.00
         (xiii)	2001 and newer	100	0.75

2. B. Gas Cap Leak Test.

   1. (1) A vehicle shall fail if the gas cap is missing, broken, or the wrong style for the vehicle.
   2. (2) The gas cap leak rate may not exceed 60 cubic centimeters per minute at a pressure of 30 inches of water column.

3. C. On-Board Diagnostics Test.

   1. (1) A vehicle shall fail if a component of the on-board diagnostics system is missing or damaged.
   2. (2) Standards for the on-board diagnostics test are specified in 40 CFR §85.2207 and 40 CFR §85.2222.

Authority: Environment Article, §§1-101, 1-404, 2-101—2-103, and 2-301—2-303;
Transportation Article, §§12-104(b), 23-202(a), 23-206.2, 23-206.4, and 23-207; Annotated Code of Maryland

Effective date: August 17, 1981 (8:16 Md. R. 1366)

Regulations .03B, .05—.09, .11—.16 amended effective September 26, 1983 (10:19 Md. R. 1691)

Regulations .03B, .08C, D, .09C, .15, and .16 amended effective December 5, 1983 (10:24 Md. R. 2190)

Regulations .02, .03, .05, .06, .08, .15, and .16 amended as an emergency provision effective January 25, 1989 (16:3 Md. R. 337) (Emergency provisions are temporary and not printed in COMAR)

Regulations .01—.16 repealed effective June 26, 1989 (16:10 Md. R. 1110)

Annotation: COMAR 11.14.06 cited in Attorney General Opinion No. 83-042 (September 28, 1983)

Chapter recodified from COMAR 11.14.06 to COMAR 11.14.08 and Regulations .01—.21 adopted effective June 26, 1989 (16:10 Md. R. 1110)

Regulation .10B amended effective July 1, 1990 (17:10 Md. R. 1220)

Regulation .16E amended effective January 1, 1992 (18:25 Md. R. 2753)

Regulation .18C amended effective January 1, 1992 (18:25 Md. R. 2753)

Regulations .01—.21 repealed and new Regulations .01—.42 adopted effective January 2, 1995 (21:26 Md. R. 2189)

Regulation .03B amended and C adopted effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .05B amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .06D amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .09 amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .09-1 adopted effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .10B, C amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .11-1 adopted effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .12 amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .29A amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .30D amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .32 amended effective December 16, 1996 (23:25 Md. R. 1785)

Regulation .42 amended effective December 16, 1996 (23:25 Md. R. 1785)

Chapter revised effective October 19, 1998 (25:21 Md. R. 1574)

Regulation .03E adopted effective June 10, 2002 (29:11 Md. R. 889)

Regulation .06A amended effective June 10, 2002 (29:11 Md. R. 889)

Regulation .09F amended effective June 10, 2002 (29:11 Md. R. 889)

Regulation .12C amended effective June 10, 2002 (29:11 Md. R. 889)

Regulation .16D amended effective June 10, 2002 (29:11 Md. R. 889)

Chapter revised effective December 14, 2009 (36:25 Md. R. 1955)

Regulation .01B amended effective January 1, 2018 (44:25 Md. R. 1180)

Regulation .03B amended effective January 1, 2018 (44:25 Md. R. 1180)

Regulation .04B amended effective January 1, 2018 (44:25 Md. R. 1180)

Regulation .05B amended effective January 1, 2018 (44:25 Md. R. 1180)

Regulation .09A amended effective January 1, 2018 (44:25 Md. R. 1180)

Chapter revised effective January 23, 2023 (50:1 Md. R. 8)