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State Emission Standards - Diesel: WASHINGTON
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 |