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 D - Emission Test Equipment Provisions
  7. 40 CFR § 90.309
40 CFR § 90.309
Engine intake air temperature measurement
June 9, 2020
CFR

(a) The measurement location must be within 10 cm of the engine intake system (i.e., the air cleaner, for most engines.)

(b) The temperature measurements must be accurate to within ±2 °C.

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§ 90.308 Lubricating oil and test fuels
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§ 90.310 Engine intake air humidity measurement

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