What is this big bright light? This video mostly shows Nippon/US Steel's Edgar Thomson Plant, but I can't tell if the bright light is actually inside the plant grounds. Happened at about 8:53pm on 10/19/2025. (BreatheCam footage via @breathe-project.bsky.social and CMU Create Lab)

This morning there was a massive plume emitted from Nippon/US Steel's Edgar Thomson Mill in the greater Pittsburgh area. There was a massive spike in particles across the river about that time. The Allegheny County Health Dept needs to investigate. @breathe-project.bsky.social @gasp-pgh.bsky.social

‼️#Stinkburgh Alert! Strong inversion predicted for tomorrow morning in Pittsburgh. Looks like it might get worse over the weekend. Submit #SmellPGH complaints and @HealthAllegheny complaints as you encounter stench! @GASPPgh @BreatheProject @cmucreatelab

What in the world happened at Nippon/US Steel's Edgar Thomson facility last night? #AirQuality Footage thanks to @breathe-project.bsky.social and CMU CREATELab. It went on for about 3 HOURS. Local air monitors seem to correlate. @gasp-pgh.bsky.social also reported high H2S last night. 🤬 🧵

And here is some BreatheCam footage from US Steel's Edgar Thomson Mill between about 8am and 8:30am. Not sure if it has any relation to the smells, but something was emitted from that plant about an hour before the levels spiked. (Footage thx to @breathe-project.bsky.social and CMU CREAT Lab)

Explosion reported at Clairton Coke Works today. See the #BreatheCam footage below (footage courtesy of the CMU CREATE Lab and Breathe Project
@breathe-project.bsky.social). #AirQuality #safety

Just saw this on my drive home today. When will US Steel/Nippon Steel be forced to stop doing this?
😢🏭 #airquality Video credit to BreatheCam by the CREATE Lab at CMU and @breathe-project.bsky.social