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Some U.S. states are starting to be caught between rising background levels of ozone pollution and legal standards that continue to be ratcheted down. Background ozone pollution-some of it natural, some of it carried across the Pacific Ocean from Asia-continues to rise, especially in the high-altitude states of the mountain west. Scientists say that ozone pollution is no longer a problem that can be dealt with by local regulations alone. [Source: Science/AAAS News]
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