Bad Air Week in Pittsburgh
Strong inversion in the Mon Valley at Clairton Coke Works, 23 Oct 2026, 7:09am (screenshot from BreatheCam Project)
23 October 2026
If you live in Pittsburgh’s Monongahela Valley and the air has smelled like rotten eggs this week or you’re finding it hard to breathe here’s why.
This week’s beautiful sunny days and cold nights cause inversions when warm air above traps cold air in our valleys. All of our valleys are affected but the Monongahela Valley has three heavy industries that produce air pollution — Clairton Coke Works, Irvin Works and Edgar Thomson Works…
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