Challenges of a lowered U.S. ozone standard
作者： O. R. Cooper , A. O. Langford , D. D. Parrish , D. W. Fahey
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摘要: At Earth's surface, ozone is an air pollutant that causes respiratory health effects in humans and impairs plant growth productivity ( 1 ). The Clean Air Act (CAA) of 1970 mandates the U.S. Environmental Protection Agency (EPA) assess standard every 5 years revise when necessary to protect human health. With a decision expected October 2015 as whether will be toughened, we discuss limitations precursor observations hinder ability state local pollution–control agencies accurately attribute sources within their jurisdictions. Attaining lower may particularly challenging high elevations western United States, which are more likely affected by has been transported long distances or originated stratosphere.
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