40 CFR 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.
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.