: To get the raw text/XML files for Title 40 (which includes Part 51), visit the GPO GovInfo Bulk Data page.

: It provides the technical "rulebook" for how air pollution dispersion should be measured and predicted.

: Critics often argue that the strict submittal timelines can be difficult for smaller state agencies to meet, leading to "SIP backlogs". If you'd like, I can help you find:

: Rules for permitting new industrial facilities to ensure they don't degrade local air quality. The "Good" (Pros)

: The technical appendices (like Appendix W for air quality modeling) are notoriously difficult for non-experts to navigate.

: It ensures that a "clean air" standard in Texas is measured and enforced with the same rigor as one in New York.

The or "proposed rules" currently being reviewed for Part 51

: Subpart A detail how states must report their data to the EPA.