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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
9/20/2020

9VAC5-91-185. Clean Screen Vehicle Emissions Standards for on-Road Testing.

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

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 Clean Air Act; 40 CFR Part 51, Subpart S.

Historical Notes

Derived from Volume 29, Issue 09, eff. December 15, 2012; amended, Virginia Register Volume 35, Issue 05, eff. November 28, 2018.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

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