StacksVerified U.S. regulatory reference

40 CFR Part 60, Table 1

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Minimum screening frequencyMinimum detection thresholdof screening technology *(kg/hr)
Quarterly≤1
Bimonthly≤2
Bimonthly + Annual OGI≤10
Monthly≤5
Monthly + Annual OGI≤15

* Based on a probability of detection of 90%.