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40 CFR 63 Subpart H Appendix 1 RegSenseCFR RegulationsEnvironmental Protection Agency (EPA)Hazardous Air PollutantsEnvironmentalAir QualityFocus AreaUSAEnglishAir ProgramsCFR Appendix
Monitoring Frequency for Equipment Other than Connectors 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. ['Air Programs']['Hazardous Air Pollutants']