Virginia Administrative Code
Title 9 - ENVIRONMENT
Agency 5 - STATE AIR POLLUTION CONTROL BOARD
Chapter 91 - REGULATIONS FOR THE CONTROL OF MOTOR VEHICLE EMISSIONS IN THE NORTHERN VIRGINIA AREA
Part III - Emission Standards for Motor Vehicle Air Pollution
Section 9VAC5-91-185 - Clean screen vehicle emissions standards for on-road testing

Universal Citation: 9 VA Admin Code 5-91-185

Current through Register Vol. 41, No. 3, September 23, 2024

A. Clean screen vehicles shall be identified by an on-road emissions inspector using on-road testing based on all of the following criteria until the provisions of subsection B of this section become effective according to the schedule in subsection D of 9VAC5-91-740:

1. Up to 5.0% of the number of vehicles measured during any 30-day period may be identified as clean screen vehicles. This percentage may be evaluated annually by the department and adjusted based on the amount of emissions reduction lost due to clean screening.

2. Vehicles that have the cleanest measurements based on an average of at least three measurements (taken on three different days in a 120-day time period) may be identified as clean screen vehicles.

3. Vehicles must have no measurements exceeding the on-road high emitter emissions standard within the 120-day time period as required in subdivision 2 of this subsection to be identified as clean screen vehicles.

4. Vehicles must not be equipped with an OBD system unless DEQ makes a determination to include certain OBD model years based on evidence that there would not be a significant loss in emissions reduction benefits.

B. Vehicles shall be identified as clean screen vehicles by an on-road emissions inspector using on-road testing based on the following criteria:

1. The vehicle is due for an emissions inspection test within 120 days;

2. The result of the most recent initial emissions test on record with the department is not a "fail";

3. No on-road emissions measurement since the most recent initial emissions test exceeds the on-road high emitter emissions standards as determined according to 9VAC5-91-180 B;

4. The two most recent on-road emissions measurements taken within 12 months of the registration expiration date shall not exceed the clean screen standards as determined in subsection D of this section and the vehicle must have a vehicle emissions index no greater than 80; or

5. The most recent on-road emissions measurement taken within 12 months of the registration expiration date shall not exceed the clean screen standards as determined in subsection D of this section and the vehicle shall have a vehicle emissions index no greater than 75.

C. On an annual basis, at least 2.0% of the vehicles meeting the clean screen criteria in subsection B of this section shall not be notified of the clean screen and may receive an emissions test at an emissions inspection station. The department shall analyze these test results to determine the effect of on-road testing on total emissions reductions. The director may decrease the maximum vehicle emissions index specified in subdivision B 4 and 5 of this section as necessary to ensure compliance with federal requirements in accordance with 9VAC5-91-740 F.

D. The clean screen vehicle standards are determined as a percentage of the values in Table III-C. The director may adjust the percentage between 50% to 80% to ensure compliance with federal requirements in accordance with 9VAC5-91-740 F.

E. The director may exempt certain vehicle models with known emissions related deficiencies.

F. Clean screen vehicles in accordance with subsections A and B of this section may be recorded as having passed the next emissions inspection required by § 46.2-1178 of the Code of Virginia and the result shall be entered into the emissions inspection record for that vehicle.

TABLE III-C
On Road Clean Screen Maximum Standards
Emissions Test Weight (ETW)	LDGV			LDGT 1 & 2
Emissions Test Weight (ETW)	HC(ppm)	CO(%)	NO (ppm)	HC(ppm)	CO(%)	NO (ppm)
1750	136	0.77	1095	136	0.77	1095
1875	129	0.73	1031	129	0.73	1031
2000	123	0.69	973	123	0.69	973
2125	116	0.66	920	116	0.66	920
2250	111	0.62	871	111	0.62	871
2375	106	0.59	827	106	0.59	827
2500	101	0.57	786	101	0.57	786
2625	97	0.54	749	97	0.54	749
2750	93	0.52	715	93	0.52	715
2875	89	0.50	684	89	0.50	684
3000	86	0.48	656	86	0.48	656
3125	83	0.46	630	83	0.46	630
3250	80	0.45	607	80	0.45	607
3375	78	0.43	585	78	0.43	585
3500	76	0.42	566	76	0.42	566
3625	74	0.41	547	75	0.41	547
3750	72	0.40	531	72	0.40	531
3875	70	0.39	515	91	0.50	644
4000	68	0.38	501	88	0.49	626
4125	67	0.37	487	87	0.48	609
4250	65	0.36	475	84	0.47	594
4375	64	0.35	463	83	0.46	579
4500	63	0.35	451	81	0.45	564
4625	61	0.34	440	79	0.44	551
4750	60	0.33	430	78	0.43	538
4875	59	0.33	420	76	0.43	525
5000	58	0.32	410	75	0.42	513
5125	57	0.31	400	74	0.41	500
5250	56	0.31	391	72	0.40	489
5375	55	0.30	382	71	0.39	478
5500	54	0.30	373	70	0.39	466
5625	53	0.30	364	68	0.38	455
5750	52	0.29	356	67	0.37	445
5875	51	0.28	348	66	0.36	435
6000	50	0.28	340	65	0.36	425
6125	49	0.27	333	64	0.35	416
6250	48	0.27	326	62	0.35	408
6375	48	0.26	320	62	0.34	400
6500	47	0.26	315	61	0.34	394
6625	46	0.26	311	60	0.34	389
6750	46	0.26	307	60	0.34	384
6875	46	0.25	305	60	0.33	382
7000	46	0.25	305	59	0.33	381
7125	46	0.25	305	59	0.33	381
7250	46	0.25	305	59	0.33	381
7375	46	0.25	305	59	0.33	381
7500	46	0.25	305	59	0.33	381

Statutory Authority: § 46.2-1180 of the Code of Virginia; § 182 of the Clear Air Act; 40 CFR Part 51, Subpart S.

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