Since its passage in 1970, the Clean Air Act has resulted in more stringent pollution standards, which have made it possible for people who lived in areas once blanketed in smog to improve their life expectancy. Those in Wichita, Kansas, are living 4.3 years longer, while residents of Phoenix, Arizona are living nearly four years longer. Even people living in Los Angeles, once the smog capital of the country, are living a year and eight months longer.
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