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The EPA is reviewing a petition from Earthjustice and community groups regarding the use of Significant Impact Levels (SILs) for ozone and fine particulate matter (PM2.5) in Louisiana and Texas. While the EPA has rejected the Title VI administrative discrimination portion of the petition due to ongoing litigation, it is conducting a broader national evaluation of SIL guidance through an internal workgroup convened in September 2023, with results expected by the end of 2024. In Louisiana, the EPA is monitoring the Louisiana Department of Environmental Quality's (LDEQ) progress in addressing modeled National Ambient Air Quality Standards (NAAQS) violations. LDEQ has identified 15 PSD permit actions since 2018 with predicted exceedances and is conducting case-by-case reviews to determine if these are indicative of actual violations or results of conservative modeling assumptions.

ClientEarth urges the European Commission to set 2019 Northeast Atlantic TACs strictly according to scientific advice to meet the 2020 MSY deadline. The organization warns against the removal of TACs to solve 'choke issues' unless risks are low and safeguards are in place, and calls for greater transparency in the decision-making process and socio-economic justifications for any departures from scientific advice.