40 CFR § 80.9 - Rounding.

---
identifier: "/us/cfr/t40/s80.9"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 80.9 - Rounding."
title_number: 40
title_name: "Protection of Environment"
section_number: "80.9"
section_name: "Rounding."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "80"
part_name: "REGULATION OF FUELS AND FUEL ADDITIVES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7414, 7521, 7542, 7545, and 7601(a)."
regulatory_source: "38 FR 1255, Jan. 10, 1973, unless otherwise noted."
cfr_part: "80"
---


# 80.9 Rounding.

(a) Test results and calculated values reported to EPA under this part must be rounded according to 40 CFR 1090.50(a) through (d).

(b) Calculated values under this part may only be rounded when reported to EPA.

(c) Reported values under this part must be submitted using forms and procedures specified by EPA.

[88 FR 44563, July 12, 2023]