Learn the Issues
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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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Clean Air Interstate Rule Historical Reports
View annual progress reports on emissions, compliance, market analyses, environmental results, and health results of the Clean Air Interstate Rule and related programs.
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NOx Budget Trading Program Historical Reports
View annual progress reports on emissions, compliance, market analyses, environmental results, and health results of the NOx Budget Trading Program and related programs.
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2017 SO2 Allowance Auction
Find on this page the results of EPA's 2017 Acid Rain Program sulfur dioxide (SO2) allowance auction.
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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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1994 SO2 Allowance Auction
Learn the results of EPA's 1994 Acid Rain Program sulfur dioxide (SO2) allowance auction results
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PGVP Audit Results
The US EPA conducts blind audits of EPA protocol calibration gas cylinder mixtures produced by specialty gas manufacturers
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2022 SO2 Allowance Auction
Find on this page the results of EPA's 2021 Acid Rain Program sulfur dioxide (SO2) allowance auction, which took place on March 30, 2021
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2023 Key Program Dates
Key dates in 2022 for Clean Air Markets programs.
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Progress Report Story Map
Power Sector Programs Progress Report
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Ozone Transport Commission NOx Budget Program Historical Report
View the 1999-2002 progress report on the NOx Budget Trading Program.