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 9VAC5-91-180 - On-road high emitter emissions standards for on-road testing through remote sensing
Current through Register Vol. 41, No. 3, September 23, 2024
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 § 46.2-1178.1B 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) | |||||
Statutory Authority
§ 46.2-1180 of the Code of Virginia; § 182 of the federal Clean Air Act; 40 CFR Part 51, Subpart S.
