Winona, Minn., got a clean bill of health from the Minnesota Pollution Control Agency (MPCA), according to its year-long study of pollutants related to diesel truck traffic and silica sand mining, according to the Winona Daily News.
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Minnesota City Monitors Silica Levels
In January 2014, the Minnesota Pollution Control Agency (MPCA) placed air-quality monitors in the city of Winona, Minn. The monitors were placed primarily to measure general particulates and crystalline silica adjacent to a silica sand transportation route.
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