GASP

10/30/2026

🚨AGAIN! 😷😤🚨

HEADS UP: Mon Valley AGAIN waking up to another H2S exceedance. #89 so far this year.

Where does the foul-smelling air pollutant even come from?

According to a 31-page study conducted by the Allegheny County Health Department, several years’ worth of H2S exceedances in the Mon Valley “can be attributed entirely to emissions from U.S. Steel’s Clairton coking facility.”

Despite U.S. Steel scapegoating landfill facilities, we want to point out that the study also stated: “ACHD did not identify evidence of any other source contributing to the exceedances.”

This is a decades-old problem that is now new owners 日鉄エンジニアリング / Nippon Steel Engineering responsibility to fix.

Smell it? A rotten 🍳odor? Then please make a report to Allegheny County Health Dept (link in bio) & via CREATE Lab’s SmellPGH app.



GASP remains troubled about these exceedances and spiking H2S levels & have to ask:

Is there something wrong at the Clairton Coke Works to be causing these days-long exceedance events, U. S. Steel and 日鉄エンジニアリング / Nippon Steel Engineering?

And more importantly: What is being done to fix this issue? Your neighbors are waiting.

10/29/2026

HEADS UP: Stank is back, friends 😷🤮🤯

Mon Valley waking up to stench & hydrogen sulfide (H2S) levels that *again* exceed the PA standard.

Smell it? Impacted by it? Please make reports to Allegheny County Health Dept & CREATE Lab’s SmellPGH app.

Today is the 86th such exceedance so far this year.

Little background: H2S is a toxic gas that occurs both naturally and as a result of industrial activity (including, most notably for our region, coke making).

According to the Agency for Toxic Substances and Disease Registry, H2S is a colorless gas recognizable by its rotten-egg odor. Exposure to the levels of hydrogen sulfide we see in the Mon Valley can cause:

✅ irritation to the eyes, nose, or throat

✅ headaches

✅poor memory

✅tiredness

✅ breathing problems for some people with asthma
balance problems

You might be asking yourself at this point, “But where does the stuff come from?” Fortunately, several studies have placed the blame squarely on U.S. Steel’s Clairton Coke Works facility.

Our question: What are new owners 日本製鉄株式会社【公式】｜NIPPON STEEL 日鉄エンジニアリング / Nippon Steel Engineering doing to fix this problem so USS’ neighbors can breathe easy for once?

10/28/2026

HOPE TO SEE YOU THERE: Join us for an Asthma & Air Quality Dinner & Panel Event on Thursday, Nov. 12!

Join GASP, Breathe PA & The University of Pittsburgh’s Center for Healthy Environments and Communities for:

✅a free evening of dinner 🥗

✅discussion 🗣️

✅ and expert insights exploring the connection between asthma 😮‍💨 and air quality 💨

📅 Thursday, November 12, 2026
⏰ 5-7 p.m.
📍 University of Pittsburgh School of Public Health

Register at gasp-pgh.org/event or scan the QR code on the flyer!

10/28/2026

Join us!

Join us for an Asthma & Air Quality Dinner & Panel Event on Thursday, November 12!

Join Breathe PA, The University of Pittsburgh's Center for Healthy Environments and Communities, and Group Against Smog and Pollution, GASP, for a free evening of dinner, discussion, and expert insights exploring the connection between asthma and air quality. Hear from a panel of experts, including Breathe PA’s Lung Health Program Manager Kristy Steele, and learn more about how air quality impacts lung health.

📅 Thursday, November 12, 2026
⏰ 5-7 p.m.
📍 University of Pittsburgh School of Public Health

Register at BreathePA.org/events or scan the QR code on the flyer!

10/27/2026

HEADS UP: Mon Valley AGAIN waking up to another H2S exceedances. #85 (!!!) so far this year.

According to the Agency for Toxic Substances and Disease Registry, H2S is a colorless gas recognizable by its rotten-egg odor.

Exposure to the levels of hydrogen sulfide we see in the Mon Valley can cause:

● irritation to the eyes, nose, or throat 🤧
● headaches 🤕
● poor memory 🤔
● tiredness 😴
● breathing problems for folks with asthma 😮‍💨
● balance problems 😳

Where does the foul-smelling air pollutant even come from?

According to a 31-page study conducted by the Allegheny County Health Department, several years’ worth of H2S exceedances in the Mon Valley “can be attributed entirely to emissions from U.S. Steel’s Clairton coking facility.”

Despite U.S. Steel scapegoating landfill facilities, we want to point out that the study also stated: “ACHD did not identify evidence of any other source contributing to the exceedances.”

This is a decades-old problem that is now new owners 日鉄エンジニアリング / Nippon Steel Engineering responsibility to fix.

Smell it? A rotten 🍳odor? Then please make a report to & via .create.lab’s SmellPGH app.

GASP remains troubled about these exceedances & have to ask: Is there something wrong at the Clairton Coke Works to be causing these days-long exceedance events, and .nipponsteel?

And more importantly: What is being done to fix this issue?

10/26/2026

The stench is REAL today, friends. Mon Valley was dealt yet another exceedance of hydrogen sulfide - or H2S for short.

Where does the foul-smelling air pollutant even come from?

According to a 31-page study conducted by the Allegheny County Health Department, several years’ worth of H2S exceedances in the Mon Valley “can be attributed entirely to emissions from U.S. Steel’s Clairton coking facility.”

Despite U.S. Steel scapegoating landfill facilities, we want to point out that the study also stated: “ACHD did not identify evidence of any other source contributing to the exceedances.”

This is a decades-old problem that is now new owners 日鉄エンジニアリング / Nippon Steel Engineering responsibility to fix.

Smell it (that rotten eggy/sulfury odor)? Make complaints to ACHD and via SmellPGH. Link in bio.

10/26/2026

📣YINZ ARE INVITED 📣

Questions on what’s in our local air? GASP’s got answers.

Join us Nov. 5 to learn more + get a copy of our newest report.

10/26/2026

HEADS UP: Mon Valley AGAIN waking up to another H2S exceedances. #82 so far this year.

According to the Agency for Toxic Substances and Disease Registry, H2S is a colorless gas recognizable by its rotten-egg odor.

Exposure to the levels of hydrogen sulfide we see in the Mon Valley can cause:

● irritation to the eyes, nose, or throat 🤧
● headaches 🤕
● poor memory 🤔
● tiredness 😴
● breathing problems for folks with asthma 😮‍💨
● balance problems 😳

Smell it? A rotten 🍳odor? Then please make a report to & via .create.lab’s SmellPGH app.

GASP remains troubled about these exceedances…

It’s not just the number of exceedances that we have been experiencing that concern us. So do the spikes recorded at the Liberty monitor and the fact that this issue persists despite millions of dollars in assessed fines against U.S. Steel (now .nipponsteel ) over the past few years for such exceedances.

10/23/2026

HERE WE GO AGAIN: Mon Valley residents AGAIN waking up to H2S concentrations that exceed the PA standard.

Today marks the 81st (!!!) time so far this year where levels of the rotten-egg smelling pollutant have exceeded that standard - vs. 58 over this time last year.

Smell it? Make complaints to Allegheny County Health Dept (link in bio) and via CREATE Lab’s SmellPGH app.

Little background:

In 1971, PA adopted ambient air quality standards for H2S. Under those standards, H2S concentrations in the ambient air may not exceed 5 parts per billion (averaged over any 24-hour period) or 1 part per million) averaged over any one-hour period).

Those standards have been incorporated into the Allegheny County Health Dept air pollution rules and regulations.

So…where does it come from? 😷

According to a 31-page study conducted by the Allegheny County Health Department, several years’ worth of H2S exceedances in the Mon Valley “can be attributed entirely to emissions from U. S. Steel Clairton coking facility.”

Despite U.S. Steel scapegoating landfill facilities, we want to point out that the study also stated: “ACHD did not identify evidence of any other source contributing to the exceedances.”

And as our friends at PennFuture pointed out: According to Allegheny County Health Dept’s Emissions Inventory USS’s own reported data show the company produces 98 percent of H2S in the county. 🤔🧐

We wonder if new owners 日鉄エンジニアリング / Nippon Steel Engineering understand the extent of this issue, how it impacts our most vulnerable neighbors, and their duty to fix it.

10/22/2026

Given today’s air quality, let’s talk inversions.

In the river valleys of southwestern Pennsylvania, the levels of fine particulates often increase dramatically at night due to a meteorological phenomenon known as an air inversion.

During an inversion, the normal vertical temperature gradient is reversed such that the air is colder near the surface of the Earth.

This can occur when, for example, a warmer, less dense air mass moves over a cooler, denser air mass.

During an inversion instead of rising high in the air pollutants become trapped close to the ground, increasing ground-level exposures.

This Breathe Project cam footage from the other morning shows this type of major inversion. The inversion conditions completely wipe out the view of the Coke Works 😳

🌈⭐️