State Emission Standards - Diesel: MASSACHUSETTS
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 | |