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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
9/29/2020

9VAC5-91-180. on-Road High Emitter Emissions Standards for on-Road Testing Through Remote Sensing.

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)

Statutory Authority

§ 46.2-1180 of the Code of Virginia; § 182 of the federal Clean Air Act; 40 CFR Part 51, Subpart S.

Historical Notes

Derived from Volume 13, Issue 05, eff. January 24, 1997; amended, Virginia Register Volume 18, Issue 20, eff. October 1, 2002; Volume 21, Issue 19, eff. June 29, 2005; Volume 29, Issue 9. eff. December 15, 2012.

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