Wildfires burning in Canada continue to bring smoke south into the U.S with air quality alerts in effect across the Midwest and upper Great Lakes.

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A Minnesota utility began shutting down a nuclear power plant near Minneapolis on Friday after discovering water containing a low level of radioactive material was leaking from a pipe for the second time. While the utility and health officials say it is not dangerous, the issue has prompted concerns among nearby residents and raised questions about aging pipelines.
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