40 CFR Part 63, Table 1
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Operating time (% of year) | Equivalent continuous process monitoring frequency time in use |
|---|---|
| Monthly | Quarterly | Semiannually |
| 0 to <25 | Quarterly | Annually | Annually. |
| 25 to <50 | Quarterly | Semiannually | Annually. |
| 50 to <75 | Bimonthly | Three times | Semiannually. |
| 75 to 100 | Monthly | Quarterly | Semiannually. |
[89 FR 43234, May 16, 2024]