Laws & Regulations

1996 SO2 Allowance Auction

Learn the results of EPA's 1996 Acid Rain Program sulfur dioxide (SO2) allowance auction results.

1995 SO2 Allowance Auction

Learn the results of EPA's 1995 Acid Rain Program sulfur dioxide (SO2) allowance auction results.

1993 SO2 Allowance Auction

Learn the results of EPA's 1993 Acid Rain Program sulfur dioxide (SO2) allowance auction results.

2015 SO2 Allowance Auction

Learn the results of EPA's 2014 Acid Rain Program sulfur dioxide (SO2) allowance auction results.

2014 SO2 Allowance Auction

Learn the results of EPA's 2014 Acid Rain Program sulfur dioxide (SO2) allowance auction results, which took place March 25, 2014.

Responses to 40 CFR Part 75 Petitions - 2011

Find responses to petitions submitted by affected units subject to 40 CFR Part 75 in 2011.

Responses to 40 CFR Part 75 Petitions - 2017

Approval for an alternative data substitution methodology.

Responses to 40 CFR Part 75 Petitions - 2021

The Agency response to the Sarpy County petition request..

1994 SO2 Allowance Auction

Learn the results of EPA's 1994 Acid Rain Program sulfur dioxide (SO2) allowance auction results

2023 Key Program Dates

Key dates in 2022 for Clean Air Markets programs.

Analysis of the Proposed NSPS for GHG Emissions from New, Modified, and Reconstructed EGUs

Find on this page the files for the Integrated Planning Model runs for EPA's proposed Guidelines for Reducing Electric utility generating unit (EGU) Emissions Nationwide (GREEN)

Interstate Transport of Fine Particulate Matter: Revision of Federal Implementation Plan Requirements for Texas

Cross-State Air Pollution Rule S02 Remand Response Rule: Interstate Transport of Fine Particulate Matter: Revision of Federal Implementation Plan Requirements for Texas

Availability of Data on Allocations of Cross-State Air Pollution Rule Allowances From New Unit Set-Asides for the 2015 Compliance Year

The Environmental Protection Agency (EPA) provides notice of the availability of preliminary calculations of emission allowance allocations to certain units under the Cross-State Air Pollution Rule (CSAPR).

Bulk Gasoline Terminals NSPS - Frequent Questions

Frequently asked questions related to the final Bulk Gas Terminals New Source Performance Standards issued in 2024

Proposed NPDES Permits/Certifications of Compliance with Section 401 of the CWA for CAFO Facilities in Thurston County, Nebraska, within the Omaha Tribe of Nebraska Reservation

EPA is seeking public comments on: 1) proposed National Pollutant Discharge Elimination System (NPDES) permits and Nutrient Management Plans for five CAFOs. located in Thurston County, Nebraska, within the Omaha Tribe of Nebraska Reservation.