Can't say that's surprising, I'm sure Pittsburgh's overall health has come a long way since they shifted away from the steel mills and factories that used to fill the city. I'd say it's hard to pin it on this one factory when they've been working to clean up the city for decades.
A while ago I saw that UPMC had more employees in PA than any other company, which I thought was pretty wild considering Pittsburgh isn't nearly as big as Philly