StacksVerified U.S. regulatory reference

40 CFR §86.434-78

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)At the conclusion of service accumulation, and after emission tests for deterioration, the Administrator may require confirmatory testing. The Administrator will designate where such testing shall be performed.
  2. (b)The manufacturer may request a retest. The results of the retest will be used to determine compliance.
  3. (c)If the emission results exceed the standard, certification will be denied.