40 CFR § 610.60 - Non-standard ambient conditions.

---
identifier: "/us/cfr/t40/s610.60"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 610.60 - Non-standard ambient conditions."
title_number: 40
title_name: "Protection of Environment"
section_number: "610.60"
section_name: "Non-standard ambient conditions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "Q"
subchapter_name: "ENERGY POLICY"
part_number: "610"
part_name: "FUEL ECONOMY RETROFIT DEVICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sec. 511, Motor Vehicle Information and Cost Savings Act, as amended (sec. 301, Pub. L. 94-163, 89 Stat. 915 (15 U.S.C. 2011))."
regulatory_source: "44 FR 17946, Mar. 23, 1979, unless otherwise noted."
cfr_part: "610"
---


# 610.60 Non-standard ambient conditions.

(a) *Extreme temperatures.* For vehicles required to be tested at extreme temperatures, the test sequence described in § 610.41 will be performed using either test track or dynamometer, in ambient temperatures outside the 60° to 90° range specified in § 610.64 as determined by the Administrator. The driveability tests described in § 610.62 may also be performed at non-standard temperatures, as determined to be necessary by the Administrator.

(b) *High altitudes.* Vehicles required to be tested at high altitudes will undergo the tests described in § 610.43 if necessary, on either test track or dynamometer as determined by the Administrator. One test location, at an elevation of no less than 4000 feet, will be selected.