U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 63Subpart BB - Subpart BB—National Emission Standards for Hazardous Air Pollutants from Phosphate Fertilizers Production Plants
§ 63.620 - Applicability.
§ 63.621 - Definitions.
§ 63.622 - Standards and compliance dates.
§ 63.624 - [Reserved]
§ 63.625 - Operating and monitoring requirements.
§ 63.626 - Performance tests and compliance provisions.
§ 63.627 - Notification, recordkeeping, and reporting requirements.
§ 63.628 - General requirements and applicability of general provisions of this part.
§ 63.629 - Miscellaneous requirements.
§ 63.630 - [Reserved]
§ 63.631 - Exemption from new source performance standards.
§ 63.632 - Implementation and enforcement.
Appendix - Table 1 to Subpart BB of Part 63—Existing Source Emission Limits a b
Appendix - Table 2 to Subpart BB of Part 63—New Source Emission Limits a b
Appendix - Table 3 to Subpart BB of Part 63—Monitoring Equipment Operating Parameters
Appendix - Table 4 to Subpart BB of Part 63—Operating Parameters, Operating Limits and Data Monitoring, Recordkeeping and Compliance Frequencies
Appendix - Table 5 to Subpart BB of Part 63—Calibration and Quality Control Requirements for Continuous Parameter Monitoring Systems (CPMS)
Appendix Appendix A - Appendix A to Subpart BB of Part 63—Applicability of General Provisions (40 CFR Part 63, Subpart A) to Subpart BB
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