eCFR Reference Browser

---

title: "40 CFR §89.325"

source: "https://www.ecfr.gov/current/title-40/section-89.325"

title_number: "40"

volume_number: "22"

chapter_number: "Unknown"

subchapter_code: "C"

subchapter_subject: "AIR PROGRAMS (CONTINUED)"

part_code: "89"

part_subject: "CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD COMPRESSION-IGNITION ENGINES"

subpart_code: "D"

subpart_subject: "Emission Test Equipment Provisions"

section_number: "89.325"

section_subject: "Engine intake air temperature measurement."

cfr_reference: "40 CFR 89.325"

title_name: "Title 40"

title_subject: "Protection of Environment"

parts_covered: "Parts 87 to 95"

revised_date: "Revised as of July 1, 2017"

publication_date: "As of July 1, 2017"

contains_description: "Containing a codification of documents of general applicability and future effect"

publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"

---

(a)Engine intake air temperature measurement must be made within 122 cm of the engine. The measurement location must be made either in the supply system or in the air stream entering the supply system.

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

§89.325 - Engine intake air temperature measurement.