40 CFR § 1048.140 - What are the provisions for certifying Blue Sky Series engines?
---
identifier: "/us/cfr/t40/s1048.140"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1048.140 - What are the provisions for certifying Blue Sky Series engines?"
title_number: 40
title_name: "Protection of Environment"
section_number: "1048.140"
section_name: "What are the provisions for certifying Blue Sky Series engines?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1048"
part_name: "CONTROL OF EMISSIONS FROM NEW, LARGE NONROAD SPARK-IGNITION ENGINES"
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. 7401-7671q."
regulatory_source: "67 FR 68347, Nov. 8, 2002, unless otherwise noted."
cfr_part: "1048"
---
# 1048.140 What are the provisions for certifying Blue Sky Series engines?
This section defines voluntary standards for a recognized level of superior emission control for engines designated as “Blue Sky Series” engines. If you certify an engine family under this section, it is subject to all the requirements of this part as if these voluntary standards were mandatory. To receive a certificate of conformity as “Blue Sky Series,” you must certify to one of the sets of exhaust emission standards in the following table:
Table 1 of § 1048.140—Standards for Blue Sky Series Engines (g/kW-hr)
| HC + NO | CO | HC + NO | CO |
| --- | --- | --- | --- |
| 0.80 | 4.4 | 1.10 | 6.6 |
| 0.60 | 4.4 | 0.84 | 6.6 |
| 0.40 | 4.4 | 0.56 | 6.6 |
| 0.20 | 4.4 | 0.28 | 6.6 |
| 0.10 | 4.4 | 0.14 | 6.6 |
[73 FR 59234, Oct. 8, 2008]