StacksVerified U.S. federal law reference

40 CFR §1066.610 — Dilution air background correction.

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Correct the emissions in a gaseous sample for background using the following equation:
  2. (c)Determine the dilution factor, DF, over the test interval for partial-flow dilution sample systems using the following equation:
  3. (d)Determine the time-weighted dilution factor, DFw, over the duty cycle using the following equation: