CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 91—CONTROL OF EMISSIONS FROM MARINE SPARK-IGNITION ENGINES > SUBPART E—Gaseous Exhaust Test Procedures (§91.401 to §91.427) > 91.418—Data evaluation for gaseous emissions.

91.418—Data evaluation for gaseous emissions.

For the evaluation of the gaseous emissions recording, record the last two minutes of each mode and determine the average values for HC, CO, CO2, and NOX during each mode from the average concentration readings determined from the corresponding calibration data.