40 CFR § 1065.940 - Emission calculations.

---
identifier: "/us/cfr/t40/s1065.940"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1065.940 - Emission calculations."
title_number: 40
title_name: "Protection of Environment"
section_number: "1065.940"
section_name: "Emission calculations."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1065"
part_name: "ENGINE-TESTING PROCEDURES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401-7671q."
regulatory_source: "70 FR 40516, July 13, 2005, unless otherwise noted."
cfr_part: "1065"
---


# 1065.940 Emission calculations.

(a) Perform emission calculations as described in § 1065.650 to calculate brake-specific emissions for each test interval using any applicable information and instructions in the standard-setting part.

(b) You may use a fixed molar mass for the diluted exhaust mixture for field testing. Determine this fixed value by engineering analysis.

[75 FR 68467, Nov. 8, 2010]