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...

Nippon/US Steel really needs to clean up its Mon Valley Works -- address community health and climate concerns all in one. We really can't wait. triblive.com/local/region...

🚨#Stinkburgh Alert! Elevated particles and stench today. And it’ll be extremely hot later today with elevated ozone. Be careful out there!

Great reporting from GASP...

We currently have more PM2.5 pollution than anywhere else in the United States. Some unholy brew of wildfire smoke and local pollution. It's awful outside and very hazy. Please be careful and crank those air filters! #airquality #wildfiresmoke

🚨🚨#Stinkburgh Alert‼️ Worst this week. Elevated VOC’s, particles, and stench reports. Make your own report via SmellPGH app. 🤮😷

🚨#Stinkburgh Alert! Elevated VOC’s, particles, and stench reports. Make your own report via SmellPGH app.

#Stinkburgh Alert! Polluted/smelly air today in Pittsburgh. More likely this week. Watch out for some light impact of wildfire smoke from Canada on our regional air quality this week, though only time (and wind) will tell if we get hit worse in the coming weeks. #SmellPGH

This is a documentary I've been working on for about 9 years, all about the community response to air pollution in Pittsburgh. It's not done yet but I'll be sharing some clips from the film tonight on Zoom. I'd love it if you were there. Registration at: bluelens.zoom.us/meeting/regi...

I'm hosting a preview screening of some clips from my Inversion Documentary tonight at 7pm on Zoom. All about air pollution in the Pittsburgh region. Hope to see you there! Register at: bluelens.zoom.us/meeting/regi... #airquality #stinkburgh @gasp-pgh.bsky.social @breathe-project.bsky.social

Mark was recently interviewed by Helen Fallon at Pittsburgh Union Progress about his upcoming preview screening of clips from Inversion Doc tomorrow (7pm). Check it out, then register for the Zoom event! @breathe-project.bsky.social @gasp-pgh.bsky.social www.unionprogress.com/2025/05/25/f...

🚨🚨#Stinkburgh Alert! Likely pollution and stench tomorrow morning. Stay alert. Report smells via SmellPgh app and ACHD website. 💩💩😞

We've got another Inversion Documentary preview screening event coming up if you missed the last one! And this time it'll be online so you can tune in from home. Hope to see you there... May 27, 7pm. Register at: bluelens.zoom.us/meeting/regi... Details at: inversiondoc.com/2025/05/14/u...

It appears that the Allegheny County Health Dept. now allows testimony via Zoom! Huge accessibility win. Just go to the linked website, click on "Wednesday, May 14: Board of Health Meeting" and then "How will you attend" -> "By Zoom" (Mtg at 5:30pm) www.alleghenycounty.us/Services/Hea...

Unsurprising, but nonetheless disappointing, to see that U.S. Steel has asked for Presidential Exemptions from the iron & steel and coke hazardous air pollutant rules - rules specifically designed to protect public health. Communities continue to pay the price for coal-based #steel.

This looks like an EXCELLENT event. I always appreciate Dr. Muller's take on air pollution.

What is the health cost of pollution to Allegheny County residents from a local economist's perspective? Join us for this insightful webinar and hear from CMU economist Nicholas Muller. Register TODAY tinyurl.com/5y38xu4h

Hooray for air quality awareness week! Sometimes I feel like we could also use more awareness of our local LACK of clean air on so many days...

Looks like there is some pollution down around Clairton this AM. Some of the readings might be from fog, but considering how we seem to have relatively widespread fog but still an orange spot in just one location, my PM2.5 concerns persist. #AirQuality

We know how to throw a party…or a screening. Clean air for everyone!