Daily eCFR

§ 87.21 Exhaust emission standards for Tier 4 and earlier engines.

40 CFR 87.21

Citation40 CFR 87.21

CorpusDaily eCFR

Displayed edition2026-05-22

Last updated2026-05-22

Exhaust emission standards apply to new aircraft engines as described in 40 CFR 1031.40 through 1031.90.