I live about 50 miles from Centralia. I haven't gone through there in likely 5 or 6 years. I did pass through that town numerous times a year for many decades since the 1950's. Usually enroute to the northern mountains or to visit friends upstate. It was a well-kept town before the coal vein fire eventually shut it down. There was a well-known speed and motorcycle shop in the middle of town named the "Speed Spot". Even long after the tear downs were started, you could still drive through the town for some years. Then a bypass route was set up for that section of highway. A number of residents refused to leave. I don't know the latest, but there may still be one or two residents alive. In more recent years the smell and steam escaping haven't seemed nearly as notable.
The so-called graffiti highway was covered in soil by the property owner a couple of years ago. I believe it had become a total clown fest there.
There are quite a few other PA. underground coal vein fires the last I have heard. Some predate the Centralia fire.