GroundRules
9VAC5-91-180: On-road high emitter emissions standards for on-road testing through remote sensing
Where this section sits in the 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
A. No affected motor vehicle shall exceed the on-road high emitter emissions standards for carbon monoxide (CO), hydrocarbons (HC), or nitric oxide (NO) when measured with a remote sensing device and in accordance with the inspection procedures prescribed in Part XII (9VAC5-91-740 et seq.).
B. The on-road high emitter emissions standards for a vehicle shall be determined by multiplying the value in the Table III-B of 9VAC5-91-180 by the ASM 25-25 standard in 9VAC5-91-810 or two speed idle standard in Table III-A of 9VAC5-91-160 as is applicable for the vehicle.
C. Any affected motor vehicle determined to have exceeded any on-road high emitter emissions standards when measured by a remote sensing device in accordance with the procedures of Part XII (9VAC5-91-740 et seq.) may be subject to an emissions inspection at an emissions inspection station in accordance with Part XII (9VAC5-91-740 et seq.) or a civil charge in accordance with § 46.2-1178.1 B of the Code of Virginia, or both.
D. Any affected motor vehicle that exceeds the on-road high emitter emissions standards two days in any 120-day period shall be considered to have violated the emissions standards. In addition, the department may use the vehicle emissions index as a screening requirement.
E. Any affected motor vehicle that exceeds the on-road high emitter emissions standards once and is also determined to have a vehicle emissions index of greater than 75 shall be considered to have violated the on-road high emitter emissions standards.
F. All remote sensing measurements used to determine if a vehicle exceeds the on-road high emitter emissions standards shall be taken at valid sites under conditions at which the vehicle specific power (VSP) indicator is between 3 and 22. Standards for NO shall be corrected for VSP using the following formula:
NO standard = Low Range Value + (VSP-3)/
19 x (High Range Value - Low Range Value).
Where:
Low Range Value = the smaller values in Table III-B in the NO (ppm) Range column;
VSP = vehicle specific power indicator; and
High Range Value = the larger values in Table III-B in the NO (ppm) Range column.
G. The director may adjust the values in Table III-B if it is determined that an on-road high emitter emissions standard is causing a confirmation test pass rate in excess of 20% or less than 5.0%. Such adjustments may be for specific models within each model year group based on manufacturer's emissions control technology.
TABLE III‑B.
HIGH EMITTER VALUES FOR REMOTE SENSING
One or More On-Road Measurements
ASM Based
Vehicle Must Have a Vehicle Emissions Index of 75% or Higher
Period/Model Year/Vehicle Type
CO
HC
NO Range(1)
Low
High
1981 through 1990 - LDGT (1 or 2)
4.0
5.0
2.5
3.3
1981 through 1990 - LDGV
12.0
4.5
1.5
2.0
1991 through 1995 - LDGT (1 or 2)
4.0
5.0
2.5
3.3
1991 through 1995 - LDGV
8.0
6.0
1.5
2.0
1996 and newer - LDGT (1 or 2)
7.0
4.5
2.5
3.3
1996 and newer - LDGV
9.0
6.0
2.2
2.9
Two or More On-Road Measurements
ASM Based
Period/Model Year/Vehicle Type
CO
HC
NO Range(1)
Low
High
1981 through 1990 – LDGT (1 or 2)
3.0
3.8
2.1
2.8
1981 through 1990 – LDGV
9.0
3.4
1.3
1.7
1991 through 1995 – LDGT (1 or 2)
3.0
3.8
2.1
2.8
1991 through 1995 – LDGV
6.0
4.5
1.3
3.3
1996 and newer LDGT (1 or 2)
5.3
3.4
2.1
2.8
1996 and newer LDGV
6.8
4.5
1.9
2.5
One or More On-Road Measurements
TSI Based
Vehicle Must Have a Vehicle Emissions Index of 75% or Higher
Period/Model Year/Vehicle Type
CO
HC
NO Range(1)
Low
High
1968 through 1980– LDGT (1 or 2)
2.0
1.5
1968 through 1980 – LDGV
2.0
1.5
1968 through 1980 – HDGV
2.0
1.5
1981 through 1990 – LDGT (1 or 2)
3.0
3.5
1981 through 1990 – LDGV
3.0
3.5
1981 through 1990 – HDGV
3.0
3.5
1991 through 1995 – LDGT (1 or 2)
3.0
4.0
1991 through 1995 – LDGV
3.0
4.0
1991 through 1995 – HDGV
3.0
4.0
1996 and newer – LDGT (1 or 2)
4.0
4.0
1996 and newer – LDGV
4.0
4.0
1996 and newer – HDGV
4.0
4.0
Two or More On-Road Measurements
TSI Based
Period/Model Year/Vehicle Type
CO
HC
NO Range(1)
Low
High
1968 through 1980– LDGT (1 or 2)
1.5
1.1
1968 through 1980 – LDGV
1.5
1.1
1968 through 1980 – HDGV
1.5
1.1
1981 through 1990 – LDGT (1 or 2)
2.3
2.6
1981 through 1990 – LDGV
2.3
2.6
1981 through 1990 – HDGV
2.3
2.6
1991 through 1995 – LDGT (1 or 2)
2.3
3.0
1991 through 1995 – LDGV
2.3
3.0
1991 through 1995 – HDGV
2.3
3.0
1996 and newer – LDGT (1 or 2)
3.0
3.0
1996 and newer – LDGV
3.0
3.0
1996 and newer – HDGV
3.0
3.0
1NO Value = Low Range Value + (Actual VSP-3)/19 x (High Range Value – Low Range Value)
Collected 2026-09-14T04:48:41Z. Source file · JSON