Code of Federal Regulations > Title 40 > Chapter I > Part 51 > Subpart A - Subpart A—Air Emissions Reporting Requirements

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

GENERAL INFORMATION FOR INVENTORY PREPARERS

§ 51.1 - Who is responsible for actions described in this subpart?

§ 51.5 - What tools are available to help prepare and report emissions data?

§ 51.10 - [Reserved]

SPECIFIC REPORTING REQUIREMENTS

§ 51.15 - What data does my state need to report to EPA?

§ 51.20 - What are the emission thresholds that separate point and nonpoint sources?

§ 51.25 - What geographic area must my state's inventory cover?

§ 51.30 - When does my state report which emissions data to EPA?

§ 51.35 - How can my state equalize the emission inventory effort from year to year?

§ 51.40 - In what form and format should my state report the data to EPA?

§ 51.45 - Where should my state report the data?

§ 51.50 - What definitions apply to this subpart?

Appendix Appendix A - Appendix A to Subpart A of Part 51—Tables