Laws & Regulations
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2007 SO2 Allowance Auction
Learn the results of EPA's 2007 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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2005 SO2 Allowance Auction
Learn the results of EPA's 2005 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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2002 SO2 Allowance Auction
Learn the results of EPA's 2002 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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2001 SO2 Allowance Auction
Learn the results of EPA's 2001 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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1999 SO2 Allowance Auction
Learn the results of EPA's 1999 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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1998 SO2 Allowance Auction
Learn the results of EPA's 1998 Acid Rain Program sulfur dioxide (SO2) allowance auction results
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1997 SO2 Allowance Auction
Learn the results of EPA's 1997 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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1996 SO2 Allowance Auction
Learn the results of EPA's 1996 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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1995 SO2 Allowance Auction
Learn the results of EPA's 1995 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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1993 SO2 Allowance Auction
Learn the results of EPA's 1993 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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2015 SO2 Allowance Auction
Learn the results of EPA's 2014 Acid Rain Program sulfur dioxide (SO2) allowance auction results.
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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.
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Responses to 40 CFR Part 75 Petitions - 2011
Find responses to petitions submitted by affected units subject to 40 CFR Part 75 in 2011.
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Responses to 40 CFR Part 75 Petitions - 2017
Approval for an alternative data substitution methodology.
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Responses to 40 CFR Part 75 Petitions - 2021
The Agency response to the Sarpy County petition request..
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1994 SO2 Allowance Auction
Learn the results of EPA's 1994 Acid Rain Program sulfur dioxide (SO2) allowance auction results
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2023 Key Program Dates
Key dates in 2022 for Clean Air Markets programs.
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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)
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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
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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).