CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES > SUBPART C—Emission Regulations for 1994 and Later Model Year Gasoline-Fueled New Light-Duty Vehicles, New Light-Duty Trucks and New Medium-Duty Passenger Vehicles; Cold Temperature Test Procedu > 86.244-94—Calculations; exhaust emissions.

86.244-94—Calculations; exhaust emissions.

The provisions of § 86.144-94 apply to this subpart, except that NOX measurements are optional. Should NOX measurements be calculated, note that the humidity correction factor is not valid at colder temperatures. Light-duty vehicles and light-duty trucks must calculate and report the weighted mass of each relevant pollutant, i.e., THC, CO, THCE, NMHC, NMHCE, CH4, NOX, and CO2 in grams per vehicle mile.

Code of Federal Regulations

[71 FR 77926, Dec. 27, 2006; 72 FR 7921, Feb. 21, 2007]