1. LawStack
  2. Title 40 - Protection of Environment
  3. Chapter I - ENVIRONMENTAL PROTECTION AGENCY
  4. Subchapter C - AIR PROGRAMS
  5. Part 90 - CONTROL OF EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR BELOW 19 KILOWATTS
  6. Subpart E - Gaseous Exhaust Test Procedures
  7. 40 CFR § 90.418
40 CFR § 90.418
Data evaluation for gaseous emissions
June 9, 2020
CFR

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. Longer averaging times are acceptable, but the reported sampling period must be a continuous set of data.

[70 FR 40449, July 13, 2005]

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§ 90.417 Fuel flow measurement specifications
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§ 90.419 Raw emission sampling calculations—gasoline fueled engines

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