Section 1066.701 - Applicability and general provisions(a) The procedures of this part 1066 may be used for testing at any ambient temperature. Section 1066.710 describes the provisions that apply for testing vehicles at a nominal temperature of -7 °C (20 °F); these procedures apply for motor vehicles as described in 40 CFR part 86, subpart S, and 40 CFR part 600 . For other vehicles, see the standard-setting part to determine if your vehicle is required to meet emission standards outside the normal (20 to 30) °C ((68 to 86) °F) temperature range.(b) Do not apply the humidity correction factor in § 1066.615(a) for cold temperature testing. 79 FR 23823 , Apr. 28, 2014, as amended at 80 FR 9122 , Feb. 19, 2015