5 Colo. Code Regs. § 1001-15, pt. C

Current through Register Vol. 47, No. 20, October 25, 2024

Part C - STANDARDS FOR VISIBLE POLLUTANTS FROM DIESEL ENGINE POWERED VEHICLES (Operating on Roads, Streets and Highways)

I. No person shall emit or cause to be emitted into the atmosphere from any diesel-powered motor vehicle of fourteen thousand pounds Gross Vehicle Weight Rating or less, any air contaminant, for a period greater than five (5) consecutive seconds, which is of such a shade or density as to obscure an observer's vision to a degree in excess of 40% opacity.

II. No person shall emit or cause to be emitted into the atmosphere from any diesel-powered motor vehicle of more than fourteen thousand pounds Gross Vehicle Weight Rating/any air contaminant, for a period greater than five (5) consecutive seconds, which is of such a shade or density as to obscure an observer's vision to a degree in excess of 35% opacity, with the exception of Subpart III or Subpart IV.

III. No person shall emit or cause to be emitted into the atmosphere from any naturally aspirated (non-turbocharged) diesel-powered motor vehicle of more than fourteen thousand pounds Gross Vehicle Weight Rating/Gross Combination Weight, operated above 7,000 feet (mean sea level) any air contaminant for a period greater than five (5) consecutive seconds, which is of such a shade or density as to obscure an observer's vision to a degree in excess of 40% opacity.

IV. No person shall emit or cause to be emitted into the atmosphere from any diesel-powered motor vehicle of more than fourteen thousand pounds Gross Vehicle Weight Rating any air contaminant which is of such a shade or density as to obscure an observer's vision to a degree in excess of 40% opacity when tested using an SAE J1667 Snap acceleration test procedure.

V. No person shall emit or cause to be emitted into the atmosphere from any diesel-powered motor vehicle under transient conditions, any air contaminant, for any period of time, which is of such a shade or density as to obscure an observer's vision to a degree in excess of 60% opacity.

VI. Any diesel-powered motor vehicle exceeding these requirements shall be exempt for a period of 10 minutes, if the emissions are a direct result of a cold engine start-up and provided the vehicle is in a stationary position.

These standards shall apply to motor vehicles intended, designed, and manufactured primarily for travel or use in transporting person, property, auxiliary equipment, and/or cargo over roads, streets, and highways.

Enforcement of these emission standards shall be by peace officers and environmental officers pursuant to the authority of 42-4-412, or 42-4-413 C.R.S., within program boundaries.

5 CCR 1001-15, pt. C

39 CR 18, September 25, 2016, effective 10/15/2016

41 CR 21, November 10, 2018, effective 11/30/2018