It counters the author's argument that he smelled something.

Not at all. He talked to a County official that confirmed the Industrial Pollution, cited an app that has other anecdotal accounts by others in Pittsburgh. His article isn't simply a one line about smelling something.

So then take some sample where the other commenter is at and compare.

This isn't a court of law. We don't need to crucify people for providing their experiences...

You know that crucifixion is something worse than someone saying "i need a better counterargument" on a discussion forum, right?

True it is exactly the same number of data points as well.

Pull up a elevation/topo map of Pittsburgh and you'll see why some people will smell something while others don't. It's very hilly and it would be easy for certain particulates/gasses to settle in some places but not others.