Here you can see the spike on the Kennywood Hills B monitor. Anybody in that area encounter this in real-time?

Meant to say that "BREATHECAM footage thanks to @BreatheProject and @cmucreatelab." :-)

And a monitor a little further away (this was a PurpleAir monitor - not an EPA monitor - but is on the EPA map) shows even higher levels.

Even the local EPA regulatory monitor showed a notable spike last night.

Here are local PurpleAir monitors near the plant showing significant particle pollution around that time. Winds were very slow.

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)

VOC's are still spiking.

Now VOC’s are spiking:

Hard to tell. I didn’t see anything notable on the BreatheCam.