eCFR Reference Browser

---

title: "40 CFR §89.113"

source: "https://www.ecfr.gov/current/title-40/section-89.113"

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: "B"

subpart_subject: "Emission Standards and Certification Provisions"

section_number: "89.113"

section_subject: "Smoke emission standard."

cfr_reference: "40 CFR 89.113"

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)Exhaust opacity from compression-ignition nonroad engines for which this subpart is applicable must not exceed:

(1)20 percent during the acceleration mode;

(2)15 percent during the lugging mode; and

(3)50 percent during the peaks in either the acceleration or lugging modes.

(b)Opacity levels are to be measured and calculated as set forth in 40 CFR part 86, subpart I. Notwithstanding the provisions of 40 CFR part 86, subpart I, two-cylinder nonroad engines may be tested using an exhaust muffler that is representative of exhaust mufflers used with the engines in use.

(c)The following engines are exempt from the requirements of this section:

(1)Single-cylinder engines;

(2)Propulsion marine diesel engines; and

(3)Constant-speed engines.

§89.113 - Smoke emission standard.