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Unfortunately, to our knowledge, direct estimates of Mexican WTP for reductions in the health endpoints considered in this paper are not yet available. Therefore, we use WTP parameters (for adult respiratory symptom days, adult reduced activity days, asthma attacks, and chronic bronchitis) that are based on U.S. studies. But given that average income adjusted for purchasing power parity is approximately four times as high in the United States as in Mexico, Mexican WTP may be lower than American WTP. Cultural factors may also cause WTP in the two countries to differ. To account for international differences. | FACT SHEET The Cross-State Air Pollution Rule Reducing the Interstate Transport of Fine Particulate Matter and Ozone ACTION On July 6 2011 the US Environmental Protection Agency EPA finalized a rule that protects the health of millions of Americans by helping states reduce air pollution and meet Clean Air Act standards. This final rule replaces EPA s 2005 Clean Air Interstate Rule CAIR . A December 2008 court decision found flaws in CAIR but kept CAIR requirements in place temporarily while directing EPA to issue a replacement rule. In order to replace CAIR as quickly as possible addressing the problem of air pollution that is transported across state boundaries EPA is adopting federal implementation plans or FIPs for each of the states covered by this rule. This final Cross-State Air Pollution Rule meets the Clean Air Act requirements and responds to the court s concerns. The Cross-State Air Pollution Rule requires 27 states in the eastern half of the United States to significantly improve air quality by reducing power plant emissions that cross state lines and contribute to ground-level ozone and fine particle pollution in other states. This action builds on more than fifteen years of progress in implementing Clean Air Act reductions of sulfur dioxide SO2 and nitrogen oxides NOX . At the same time the Agency also issued a supplemental proposal that would require six states Iowa Kansas Michigan Missouri Oklahoma and Wisconsin to make summertime NOX reductions under the Cross-State Air Pollution Rule ozone-season control program. Five of those states are already covered in the final rule for interstate fine particle pollution PM2.5 . Finalizing this supplemental proposal would bring the total number of covered states under the Cross-State Air Pollution Rule to 28. The 800 million spent annually on this rule in 2014 along with the roughly 1.6 billion per year in capital investments already under way as a result of CAIR are improving air quality for over 240 million
