Well pads, compressor stations, diesel truck traffic. Hydraulic fracturing, or fracking, involves many moving parts, some of which have the potential to vent pollutants into the air southwestern Pennsylvanians breathe. Fracking doesn’t consist of large, stationary pollution sources, like U.S. Steel’s metallurgical coke plant in Clairton, where emissions are monitored daily, the pollutants they contain …






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