From bottom right, a conveyor carries sand from the crushing area to a wash plant tower to be washed and sorted by grain size at the Preferred Sands plant in Blair, Wis., on June 20, 2012. Lukas Keapproth / WCIJ
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Air pollution has been a top concern for some residents in frac sand mining areas, but the science on the issue has been scarce.

Tonight, Wisconsin Public Television’s Frederica Freyberg will talk with University of Wisconsin-Eau Claire public health professor Crispin Pierce about the results of his study on air quality at mines around the state.

You can catch that segment on Here and Now on WPT at 7:30 p.m. Central time, or watch online.

The Center has been covering the rise in sand mining since summer 2011, and our map of frac sand locations, last updated in October 2012, has been among our most popular work.

Some of our coverage:

Sand mining surges in Wisconsin July 31, 2011
Are frac sand miners failing to check for rare butterfly? Jan. 31, 2012
Permits: What a frac sand mine needs Sidebar, Jan. 31, 2012
Wisconsin frac sand sites double July 22, 2012
Frac sand boom creates thousands of jobs Aug. 12, 2012
As supply meets demand, Wisconsin’s frac sand rush slows Dec. 15, 2012

The nonprofit Wisconsin Center for Investigative Journalism ( collaborates with Wisconsin Public Radio, Wisconsin Public Television, other news media and the UW-Madison School of Journalism and Mass Communication. All works created, published, posted or disseminated by the Center do not necessarily reflect the views or opinions of UW-Madison or any of its affiliates.

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Kate Golden, multimedia director and reporter, specializes in environmental stories and data visualizations.