Yesterday, Pennsylvania Department of Environmental Protection (DEP) announced today the results of the latest in a series of air quality studies near Marcellus Shale natural gas operations. This study, which was conducted in Bradford, Lycoming, Sullivan and Tioga counties, did not find any emission levels that would pose a public health concern. “The results show there are no emission levels that would be of concern to the health of residents living and working near these operations,” DEP Secretary Mike Krancer said. “They are consistent with the results of our air monitoring in southwest and northeast Pennsylvania, the other two areas of the state with the most Marcellus drilling.”