# Clean Air Act Type: Technology Source: Climate Intelligence Brief — https://getclimatebrief.com/entity/clean-air-act-technology Canonical HTML page: https://getclimatebrief.com/entity/clean-air-act-technology ## Timeline - **2026-03-20T00:25:25Z**: — The Trump administration EPA officially revokes the 2009 scientific finding. - **2026-03-20T00:25:25Z**: — Public health and environmental groups file the first lawsuit against the repeal. - **2026-03-20T00:25:25Z**: — 24 states and 10 cities file a major challenge in the D.C. Circuit Court of Appeals. - **2026-03-19**: States File Lawsuit — A coalition of states sues to block the repeal, alleging it violates the Clean Air Act. - **2026-03-19**: Multi-State Lawsuit Filed — A coalition of 23 states and 14 cities sues the EPA in the D.C. Circuit Court of Appeals. - **2026-03-18**: Repeal Announced — The Trump EPA formally moves to repeal the 2009 finding, citing a need for deregulation. - **2026-03-09**: Public Outcry — Massive influx of public letters and editorials published in regional news outlets across the U.S. - **2026-03-04**: RMP Revisions — EPA proposes rolling back Risk Management Program safety standards for industrial facilities. - **2026-02-27**: Social Cost Revision — New guidelines set the economic value of human life and carbon mitigation to zero in cost-benefit models. - **2026-02-26**: Endangerment Repeal — EPA formally rescinds the 2009 finding that GHGs threaten public health. - **2026-02-15**: Trump Revokes Finding — The Trump administration formally terminates the 2009 conclusion to halt climate regulations. - **2009-12-15**: Endangerment Finding Issued — EPA officially determines that six greenhouse gases threaten the health of current and future generations. - **2009-12-07**: Endangerment Finding Issued — The EPA under President Obama officially declares greenhouse gases a threat to public health. - **2009-12-07**: Endangerment Finding Issued — The EPA determines greenhouse gases threaten public health, triggering Clean Air Act mandates. - **2007-04-02**: Massachusetts v. EPA — Supreme Court rules EPA has authority to regulate GHGs if they are found to endanger public health. ## Recent coverage (5 stories) ### xAI’s Gas Turbines at $20B Center Spark DOJ Intervention in Pollution Suit 2026-06-28 11:31:12 · Sentiment: Bullish · Impact: 6/10 · Sources: 22 The Trump administration’s move to dismiss a lawsuit over xAI’s unpermitted natural gas turbines highlights the growing tension between AI-driven energy demand, environmental justice, and climate policy rollbacks. Full story: https://getclimatebrief.com/story/xai-climate-lawsuit-doj ### States Sue EPA Over Repeal of Landmark Climate 'Endangerment' Finding 2026-03-20 00:25:25 · Sentiment: Bearish · Impact: 8/10 · Sources: 2 A coalition of 24 states and 10 cities has filed a lawsuit against the EPA to block the repeal of the 2009 endangerment finding. The legal challenge seeks to restore the scientific foundation that allows the federal government to regulate greenhouse gas emissions under the Clean Air Act. Full story: https://getclimatebrief.com/story/states-sue-epa-endangerment-finding-repeal ### Blue States Sue to Block Trump’s Revocation of EPA Endangerment Finding 2026-03-20 00:14:51 · Sentiment: Bearish · Impact: 8/10 · Sources: 3 A coalition of 23 states and 14 cities has filed a lawsuit against the EPA to overturn the Trump administration's repeal of the 2009 endangerment finding. The legal challenge seeks to restore the scientific foundation that mandates federal regulation of greenhouse gas emissions under the Clean Air Act. Full story: https://getclimatebrief.com/story/states-sue-trump-epa-endangerment-finding ### US States Sue Trump EPA to Protect Bedrock Climate Endangerment Finding 2026-03-19 21:16:05 · Sentiment: Bearish · Impact: 8/10 · Sources: 2 A coalition of U.S. states has filed a major lawsuit against the Environmental Protection Agency (EPA) following its decision to repeal the 2009 Endangerment Finding. The legal challenge seeks to preserve the scientific determination that greenhouse gases threaten public health, which serves as the mandatory legal trigger for federal climate regulations. Full story: https://getclimatebrief.com/story/us-states-sue-epa-climate-endangerment-finding ### EPA Repeal of Endangerment Finding Triggers National Regulatory Crisis 2026-03-09 18:38:05 · Sentiment: Very Bearish · Impact: 8/10 · Sources: 2 The Environmental Protection Agency's recent repeal of the 2009 Greenhouse Gas Endangerment Finding has sparked widespread public outcry and a wave of litigation. This move effectively dismantles the legal foundation for federal climate regulation, signaling a radical shift in U.S. environmental policy. Full story: https://getclimatebrief.com/story/epa-endangerment-finding-repeal-impact --- This page is a machine-readable summary. Sentiment measures the directional read of each development for this entity, not the tone of the reporting; impact weights consequence, not syndication reach. See https://getclimatebrief.com/guides/methodology for the full editorial methodology.