Springtime ozone levels in the lower atmosphere over western North America are rising. The source of this pollution may be Asia, a finding that reaffirms the need for international air-quality control.
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Law, K. More ozone over North America. Nature 463, 307–308 (2010). https://doi.org/10.1038/463307a
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DOI: https://doi.org/10.1038/463307a
