NOTE:
Because of frequent revisions in state emission standards, the emission standards listed in this article should only be used as a guide.
ARIZONA EMISSION STANDARDS - PHOENIX & TUCSON AREA (DIESEL OPACITY LOADED CRUISE TEST)
Application
Altitude (Feet)
Opacity (% For 10 Seconds)
Light Duty Vehicles (8500 GVWR Or Less)
All Years
Less Than 2000
20 Or Less
2001-4000
30 Or Less
Greater Than 4000
40 Or Less
ARIZONA EMISSION STANDARDS - PHOENIX & TUCSON AREA (DIESEL J1667 SNAP IDLE TEST)
Application
Altitude (Feet)
Opacity (% For 10 Seconds)
Heavy Duty Vehicles (8500 GVWR Or Greater)
1990 & Earlier
All
55
1991 & Newer
All
40
COLORADO EMISSION STANDARDS - DIESEL OPACITY
Application
Opacity %
14,000 GVWR Or Less
Non-Turbo
40
Turbo
35
14,000 GVWR Or More
Non-Turbo
35
Turbo
20
CONNECTICUT EMISSION STANDARDS - DIESEL OPACITY
Application
Opacity %
10,000 GVWR Or Less
1979 & Newer
20
26,000 GVWR Or More
1974 & Earlier
70
1974-90
55
1991 & Newer
40
IDAHO EMISSION STANDARDS - DIESEL OPACITY
Application
Opacity %
All Weight Range
1965-74
70
1975-91
55
1992 & Newer
40
KENTUCKY EMISSION STANDARDS - BOONE, CAMPBELL & KENTON COUNTIES (DIESEL OPACITY)
Application
Opacity
18,000 GVWR Or Less
All Years
10% @ Idle
MASSACHUSETTS EMISSION STANDARDS - DIESEL OPACITY
Application
Opacity %
Light Duty (8500 GVWR Or Less)
1984 & Newer
20
Light Duty (8501-10,000 GVWR Or Less)
1984 & Newer
40
Heavy Duty Buses (10,000 GVWR Or More)
1984-93
40
1994 & Newer
30
Heavy Duty Trucks (10,000 Or Less GVWR)
1984-90
55
1991 & Newer
40
NEW YORK EMISSION STANDARDS - DIESEL OPACITY TEST
Application
Opacity %
Heavy Duty Vehicles (8500 GVWR Or More)
1973 & Earlier
70
1974-90
55
1991 & Newer
40
OHIO EMISSION STANDARDS - DIESEL OPACITY TEST
Application
Opacity %
Light Duty Diesel
20
RHODE ISLAND EMISSION STANDARDS - DIESEL OPACITY TEST
Application
Opacity %
All Model Years (8500 GVWR Or Less)
20
UTAH EMISSION STANDARDS - DAVIS COUNTY - DIESEL OPACITY TEST
Application
Opacity %
Light Duty Diesel - Turbo (16,000 GVWR Or Less)
30
Light Duty Diesel - Non-Turbo (16,000 GVWR Or Less)
35
Heavy Duty Diesel (16,000 GVWR Or More)
70
UTAH EMISSION STANDARDS - SALT LAKE COUNTY - DIESEL OPACITY TEST
Application
Opacity %
All Model Years - Turbo (16,000 GVWR Or Less)
30
All Model Years - Non-Turbo (16,000 GVWR Or Less)
35
All Model Years (16,000 GVWR Or More)
70
UTAH EMISSION STANDARDS - UTAH COUNTY - DIESEL OPACITY TEST
Application
Opacity %
All Model Years - Turbo (16,000 GVWR Or Less)
30
All Model Years - Non-Turbo (16,000 GVWR Or Less)
35
All Model Years (16,000 GVWR Or More)
70
WASHINGTON EMISSION STANDARDS - DIESEL OPACITY TEST
Application
Opacity %
Light Duty Diesel (8500 GVWR Or Less)
All Model Years
20
Heavy Duty Diesel (8500 GVWR Or More)
1991 & Earlier
55
1992 & Newer
40