About Parks Attacks Blog Contact Shop

Air Pollution and Emissions


  • Canceled a requirement for oil and gas companies to report methane emissions.
  • Revised and partially repealed an Obama-era rule limiting methane emissions on public lands, including intentional venting and flaring from drilling operations.
  • Loosened a Clinton-era rule designed to limit toxic emissions from major industrial polluters
  • Stopped enforcing a 2015 rule that prohibited the use of hydrofluorocarbons, powerful greenhouse gases, in air-conditioners and refrigerators.
  • Repealed a requirement that state and regional authorities track tailpipe emissions from vehicles traveling on federal highways.
  • Reverted to a weaker 2009 pollution permitting program for new power plants and expansions.
  • Amended rules that govern how refineries monitor pollution in surrounding communities.
  • Directed agencies to stop using an Obama-era calculation of the “social cost of carbon” that rule makers used to estimate the long-term economic benefits of reducing carbon dioxide emissions.
  • Withdrew guidance that federal agencies include greenhouse gas emissions in environmental reviews. But several district courts have ruled that emissions must be included in such reviews.
  • Lifted a summertime ban on the use of E15, a gasoline blend made of 15 percent ethanol. (Burning gasoline with a higher concentration of ethanol in hot conditions increases smog.)

In Progress

  • Proposed weakening Obama-era fuel-economy standards for cars and light trucks. The proposal also challenges California’s right to set its own more stringent standards, which other states can choose to follow.
  • Announced intent to withdraw the United States from the Paris climate agreement. (The process of withdrawing cannot be completed until 2020.)
  • Proposed repeal of the Clean Power Plan, which would have set strict limits on carbon emissions from coal- and gas-fired power plants. In April 2019, the E.P.A. sent a replacement plan, which would let states set their own rules, to the White House for budget review.
  • Proposed eliminating Obama-era restrictions that in effect required newly built coal power plants to capture carbon dioxide emissions.
  • Proposed a legal justification for weakening an Obama-era rule that limited mercury emissions from coal power plants.
  • Proposed revisions to standards for carbon dioxide emissions from new, modified and reconstructed power plants.
  • Began review of emissions rules for power plant start-ups, shutdowns and malfunctions. In April, the E.P.A. filed an order reversing a requirement that 36 states follow the emissions rule.
  • Proposed relaxing Obama-era requirements that companies monitor and repair methane leaks at oil and gas facilities.
  • Proposed changing rules aimed at cutting methane emissions from landfills. In May, 2019, a federal judge ruled against the E.P.A. for failing to enforce the existing law and gave the agency a fall deadline for finalizing state and federal rules. E.P.A. said it is reviewing the decision.
  • Announced a rewrite of an Obama-era rule meant to reduce air pollution in national parks and wilderness areas.
  • Weakened oversight of some state plans for reducing air pollution in national parks. (In Texas, the E.P.A. rejected an Obama-era plan that would have required the installation of equipment at some coal-burning power plants to reduce sulfur dioxide emissions.)
  • Proposed repealing leak-repair, maintenance and reporting requirements for large refrigeration and air conditioning systems containing hydrofluorocarbons.