State Emission Standards - Gas: MASSACHUSETTS
MASSACHUSETTS EMISSION STANDARDS - MA31 TEST
| Application |
HC gpm (CO gpm) |
NOx gpm |
| Passenger Cars |
| 1984-90 |
2.0 (30) |
3.0 |
| 1991-95 |
1.2 (20) |
2.5 |
| 1996 & Newer |
0.8 (13) |
2.0 |
| Light Duty Trucks (6000 GVWR Or Less) |
| 1984-87 |
3.2 (80) |
7.0 |
| 1988-1990 |
3.2 (80) |
3.5 |
| 1991-95 |
2.4 (60) |
3.0 |
| 1996 & Newer (3750 LVW Or Less) |
0.8 (15) |
2.0 |
| 1996 & Newer (3751 LVW Or Greater) |
1.0 (20) |
2.5 |
| Light Duty Trucks (6001-8500 GVWR) |
| 1984-87 |
3.2 (80) |
7.0 |
| 1988-90 |
3.2 (80) |
5.0 |
| 1991-95 |
2.4 (60) |
4.5 |
| 1996 & Newer (5750 ALVW Or Less) |
1.0 (20) |
2.5 |
| 1996 & Newer (5751 ALVW Or Greater) |
2.4 (60) |
4.0 |
| Heavy Duty Trucks (8501-10, 000 Or Greater) |
| 1984-87 |
3.2 (80) |
7.0 |
| 1988-90 |
3.2 (80) |
5.0 |
| 1991-95 |
2.4 (60) |
4.5 |
| 1996 & Newer |
2.4 (60) |
4.0 |
MASSACHUSETTS EMISSION STANDARDS - 2-SPEED IDLE TEST
| Application |
HC ppm (CO %) |
| All Vehicles |
| 1984-86 |
220 (0.80) |
| 1987 & Newer |
100 (0.60) |