CFR /  Title 40  /  Part 89  /  Sec. 89.417 Data evaluation for gaseous emissions.

For the evaluation of the gaseous emission recording, the last 60 seconds of each mode are recorded, and the average values for HC, CO, CO2, and NOX during each mode are determined from the average concentration readings determined from the corresponding calibration data. [59 FR 31335, June 17, 1994. Redesignated at 63 FR 56996, Oct. 23, 1998]