🚨#Stinkburgh Alert! The forecast looks like we might have stench in Pittsburgh overnight. Stay alert and submit smell complaints to SmellPGH app and ACHD.

Two separate plume incidents at US Steel's Edgar Thomson Plant in Braddock, including dark grey material. US Steel wants to⬆️pollution from from ET via the new hot strip mill.🤮We have to require them to do better. (Thx to @breathe-project.bsky.social and CMU CREATE Lab for BreatheCam footage)

Morning! Here is today’s air quality forecast for Allegheny County:

Economist and author, Chris Briem, examines the fraught relationship between the steel industry and the Mon Valley. "Remaining focused on the past will only defer change that will eventually come..." #Pittsburgh www.publicsource.org/us-steel-pur...

Three more plumes at Nippon/US Steel's Edgar Thomson Plant. And USS wants to *increase* pollution at the plant with new equipment powered by fossil fuels during a climate emergency. (Thx to CMU CREATE Lab and @breathe-project.bsky.social for BreatheCam footage.) 🧵1/2

🚨#Stinkburgh Alert! Conditions appear to be ripe for overnight/AM elevated pollution and stench. Stay alert, filter your air if you can, and submit smell complaints to the ACHD and SmellPGH app. #AirQuality

Major pollution and complaints this AM. Also a plume at US Steel's Edgar Thomson Plant feeding right into a low air mass ~8am. Spike in PM2.5 via PurpleAir monitor, elevated H2S, and many SmellPGH complaints. #AirQuality #Pittsburgh (Thx to @BreatheProject & @cmucreatelab for BreatheCam footage)🧵

Yesterday at Nippon/US Steel's Edgar Thomson Plant. Plumes coming out of multiple stacks. #AirQuality #Pittsburgh (Thx to @breathe-project.bsky.social and CMU CREATE Lab for BreatheCam footage.)

Lots going on at US Steel's Edgar Thomson plant this evening. #Pittsburgh #AirQuality (Thx to @breathe-project.bsky.social and CMU CREATE Lab for BreatheCam footage)

🤮 Goodness. I hope the workers in/around that building are wearing respiratory protection. #AirQuality #Pittsburgh (Thx to the @breathe-project.bsky.social and CMU CREATE Lab for BreatheCam footage showing U.S. Steel's Edgar Thomson Mill facility emitting a cloud of something TODAY 5/30/26.)

Tomorrow night! See you there? "A Community's Right to Know: A Conversation on the Clairton Plant Explosion". "Panel Q+A with members from OSHA, the Chemical Safety Board, Valley Clean Air Now (VCAN) and the Allegheny County Health Department." luma.com/2lsbcivv

What is this? Nearly an hour of emissions from US Steel Edgar Thomson Plant in Braddock yesterday. #airquality #Pittsburgh (Thx to @breathe-project.bsky.social & CMU CREATE Lab for BreatheCam footage)

For those just logging on:

High H2S this AM in Braddock.

Strong inversion forecasted for tonight. Slow winds from the south. Likely stench in Pittsburgh overnight. Stay alert and submit smell complaints to SmellPGH app and ACHD website! #Airquality #Pittsburgh

#Stinkburgh Alert! Likely stench and elevated pollution tonight and early next week. Send smell complaints to SmellPGH app and ACHD. This video is this AM at Edgar Thomson mill -- a hazy plume emerging this building. Thx to @breathe-project.bsky.social & CMU CREATE Lab for BreatheCam footage.

I spotted seven major plumes coming out of US Steel's Edgar Thomson Plant in a single day. TODAY. 🤢 Thx to @breathe-project.bsky.social and CMU CREATE Lab for the BreatheCam footage. #airquality #Pittsburgh

Weak inversion in the morning, plus slow winds from the south-ish overnight could elevate pollution a bit. Stay alert! @gasp-pgh.bsky.social @breathe-project.bsky.social

🚨Stinkburgh Alert! Likely stench and elevated #air pollution tomorrow in #Pittsburgh. Stay alert and report smells to ACHD and SmellPGH app if you smell it! @gasp-pgh.bsky.social @breathe-project.bsky.social

We've had elevated H2S and large numbers of SmellPGH reports the last couple days in Allegheny County. Not cool. We've hit twice the number of 24-hr exceedances of the H2S standard compared to this time last year. It really stinks around here. @gasp-pgh.bsky.social @breathe-project.bsky.social

🚨‼️#Stinkburgh Alert! Strong inversion forecasted for tomorrow morning. Wind from the south. I anticipate that some areas will experience elevated pollution and stench overnight and tomorrow morning. Stay alert. Report smells via ACHD and SmellPGH if you smell something.

🚨🚨#Stinkburgh Alert‼️🤮 It's just awful outside. Loads of SmellPGH reports. Elevated VOC's, particles, and H2S pollution. The foul sulfur odor woke me up early this morning. Submit complaints to ACHD & SmellPGH app if you smell it. #AirQuality @gasp-pgh.bsky.social @breathe-project.bsky.social

‼️#Stinkburgh Alert! ACHD is already reporting a Mon Valley Air Pollution Warning. Particles, VOC’s, and H2S levels are high. Elevated pollution expected into tomorrow, too. Please be careful out there and report smells to the ACHD and SmellPGH if you encounter them.

It was so bad this morning! Thanks to GASP for this write-up! And there is a link lower in the post that explains how to submit an air quality complaint. If you are annoyed by the pollution and/or smell, please submit a complaint to SmellPGH AND the ACHD GovQA system!

Yinz smell that?! That tell-tale stench of rotten eggs? Culprit could be concentrations of Hydrogen sulfide (or H2S for short) that are sky-high in & around the Mon Valley. But the exceedances don’t tell the whole story. There were also CRAZY HIGH H2S spikes. www.gasp-pgh.org/smell-that-f...

‼️#Stinkburgh Alert!! 🚨 I woke up around 5am with a headache and the noxious foul odor of sulfur in my bedroom. VOC levels outside were super high overnight. Particles are also up. Just intolerable. I feel violated. #Pittsburgh @breathe-project.bsky.social

🎼🎶It's beginning to look a lot like a weather inversion. Image shows Edgar Thomson Plant engulfed in low lying clouds. Pollution also gets trapped with the low-lying air. We have inversions often in Pittsburgh, but not usually so visually clear. 🎼🎶

Pittsburgh Region, check this out:

#Stinkburgh Alert ‼️ I haven’t smelled it this bad in a long time. Amazing sulfur and burnt plastic smell. And my Awair VOC sensor is *really* high. 🤮

"Companies were allowed to estimate their chemical pollution using methods that even the EPA conceded were often unreliable. In 2023, the EPA received irrefutable proof that these estimates were highly flawed." www.propublica.org/article/epa-...

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)

‼️#Stinkburgh Alert! Walked out my front door a few minutes ago and learned that the "moderate inversion" had yielded awful industrial smells at my house, but not until about 9am. Looks like I'm not the only one reporting. Hopefully clearing out soon, but tomo might also be bad.

#ICYMI: What’s going on at @ussteel.bsky.social’s Edgar Thomson facility? @inversion-doc.bsky.social has flagged myriad emissions events like this one from yesterday:

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

It reeeeeaaaalllyyyy stinks like rotten eggs at my house in #Pittsburgh right now. #H2S #Stinkburgh 🏠🤢💩🏭

‼️#Stinkburgh Alert! Stench is widely reported across the Pittsburgh region today. VOC and particle levels elevated in certain areas. I decided against my morning walk because of the stench. 💩

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. 🤬 🧵

HEADS UP: Mon Valley waking up to *another* day of stench and H2S values that exceed the PA 24-hr avg standard. Smell it? Make reports to ACHD & via SmellPGH. 👀😷

🚨#Stinkburgh Alert! It’s not looking good for stench overnight and into the morning. Plus an ozone alert for the afternoon. Stay careful out there! 😶‍🌫️

🚨#Stinkburgh Alert! Suffocating burnt plastic smell in Squirrel Hill South right now. Winds coming from the south per my new little Tempest weather station. Not sure what it is. Ugh. SmellPGH shows I’m not the only one smelling it.

🚨#Stinkburgh Alert! Last night and much of today was pretty stinky. My house saw high VOC's, too. How about for you? Report smells to the SmellPGH app and ACHD website. Tonight isn't looking much better. Ugh. 🤢 #airquality

🚨#Stinkburgh Alert! Lots of stench reported last night. How are you doing?

Super-compelling new report just released by @envirointegrity.bsky.social about emissions from the steel industry across the country. The report includes details about benzene at US Steel's Clairton Coke Works. Take a look. 🏭 👀

Quick reminder: I'll be presenting a few clips from Inversion at next week's Lunch & Learn webinar hosted by @protectpt.bsky.social! Hope to see you there (these will be the same clips I've shared at other events this year, so no need to stop by if you already saw them). #airquality

I visited the area near US Steel's Clairton Coke Works today after the #explosion. Lots of emergency vehicles and press all over the place. Not to mention haze above the plant and what appeared to be semi-opaque emissions coming out of a couple of stacks. www.flickr.com/photos/96025...

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

Another Inversion Doc pre screening event! I'll be showing clips I've shared at other pre-screening events this year. Protect PT is hosting this Lunch & Learn event on August 26 at noon on Zoom. See you there! secure.everyaction.com/6v-EYfEhh0Gu...

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

Pittsburgh Environmental Action Day 2025 is coming Saturday, July 12 from 9 a.m. to noon! Hope to see you there for a rally, march and concert!!! www.eventbrite.com/e/pittsburgh...