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      "summary": "Oversight of Environmental Protection Agency (EPA) regulatory actions was the main focus of interest as the 113th Congress considered air quality issues. Of particular interest were EPA\u2019s proposed regulations on the emissions of greenhouse gases (GHGs) from power plants. \nReducing GHG emissions to address climate change is a major goal of President Obama, but Congress has been less enthusiastic about it. In the absence of congressional action, the President has directed EPA to promulgate GHG standards using existing authority under the Clean Air Act. This authority has been upheld on at least three occasions by the Supreme Court, but it remains controversial in Congress.\nEPA\u2019s most recent GHG actions have involved fossil-fueled (coal, oil, and natural gas) power plants, which EPA refers to as electric generating units (EGUs). On June 18, 2014, the agency proposed GHG emission standards for existing EGUs. These plants are the source of one-third of the nation\u2019s GHG emissions, so it is difficult to envision a regulatory scheme that reduces the nation\u2019s GHG emissions without addressing their contribution. At the same time, affordable and reliable electric power is central to the nation\u2019s economy and to the health and well-being of the population. \nThus, the effects of the proposed rule on the electric power system are of considerable interest. Even before proposal of the existing power plant standards, the House had passed legislation (H.R. 3826) that would effectively have prohibited EPA from promulgating or implementing power plant GHG emission standards. On September 18, 2014, the House passed the same language a second time, in H.R. 2. The Senate did not consider either bill.\nAlthough it has not finalized the power plant GHG regulations as of this writing, EPA has implemented permit and Best Available Control Technology requirements for new stationary sources of GHGs under a separate Clean Air Act provision, the Prevention of Significant Deterioration (PSD) program. Minimum thresholds have exempted smaller pollution sources from this program, and few facilities have needed to obtain permits. Nevertheless, EPA\u2019s authority to implement these requirements was challenged in court. In a June 23, 2014, decision, the Supreme Court largely upheld EPA\u2019s authority.\nBesides addressing climate change, EPA has taken action on a number of other air pollution regulations, often in response to court actions remanding previous rules. Remanded rules included the Clean Air Interstate Rule (CAIR) and Clean Air Mercury Rule\u2014rules designed to control the long-range transport of sulfur dioxide, nitrogen oxides, and mercury from power plants through cap-and-trade programs. Other remanded rules included hazardous air pollutant standards for boilers and cement kilns. \nThe agency has also developed revisions of several existing air standards\u2014in general, the Clean Air Act mandates that existing standards be reviewed periodically and revised if appropriate. On March 3, 2014, EPA revised regulations that limit the sulfur content of gasoline, in conjunction with tighter (\u201cTier3\u201d) standards for motor vehicle emissions. The agency has also proposed revised standards for wood and pellet stoves and proposed standards for other types of wood heaters for the first time.\nEPA is also reviewing ambient air quality standards (NAAQS) for ozone. The agency proposed revisions to the ozone NAAQS on December 17, 2014. NAAQS serve as EPA\u2019s definition of clean air for six widespread pollutants, and drive a range of regulatory controls.\nThe cost-effectiveness of some of these regulations and/or whether the agency has exceeded statutory authority in proposing and promulgating them are among the issues that have been raised by some in Congress. Others in Congress have supported EPA, noting that the Clean Air Act, often affirmed in court decisions, has authorized or required the agency\u2019s actions.",
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