N.Y. Comp. Codes R. & Regs. tit. 6, § 217-5.3
All HDDVs subject to the requirements of this Subpart and that operate in New York State, except for those exempted in section 217-5.2(a) of this Subpart, shall be subject to the smoke opacity standards set forth in Table 1 as follows:
Table 1
Smoke Opacity Standards For Heavy Duty Diesel-Fueled Vehicles
| Engine model year | Maximum opacity (percent) |
|---|---|
| 1973 and older | 70 |
| 1974 - 1990 | 55 |
| 1991 and newer | 40 |