Yinz smell that?! That tell-tale stench of rotten eggs? You’re not smelling things: Concentrations of hydrogen sulfide (or H2S for short) are sky-high in and around the Mon Valley today. And you’re not alone in your suffering - social media and Carnegie Mellon University’s Smell Pittsburgh app lit up with complaints starting overnight Monday and continuing into the afternoon Tuesday: For the uninitiated: H2S is a toxic gas that occurs both naturally (from sources such as swamps, manure pits, and oil, gas, and water wells) 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 Just how elevated were levels of the foul-smelling pollutant? The short answer: They were high enough to exceed the Pennsylvania Department of Environmental Protection’s 24-hour average standard, marking the first exceedances of the new year. But those exceedances don’t tell the whole story on today’s H2S event. There were also  crazy-high H2S spikes at Allegheny County Health Department’s air quality monitors in both Liberty and North Braddock. For reference: Pennsylvania’s 24-hour average standard for H2S is 5 parts per billion. As of 11 a.m. Tuesday, the 24-hour average for H2S at the Liberty monitor was more than twice that. Here’s a look at those spikes: 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. You can read more about all that here . So, what can you do about it? Two words: Report it. Make a complaint to the Allegheny County Health Department, which is tasked with enforcing DEP’s H2S standard. We also implore you to report poor air quality on the Smell Pittsburgh app. GASP is following this issue closely and has - and will continue - to demand ACHD do more to stem stench in the Mon Valley through more robust enforcement. “This issue has been ongoing for decades. Knowing the source is awesome, but it’s not enough. More must be done to reel in these episodes of hours-long stench that residents say impact everything from their sleep to their breathing to their quality of life,” GASP Executive Director Patrick Campbell said. “There were just as many H2S exceedances in 2025 as there were in 2024. So, we’re NOT making progress on this issue, just holding the line at best.”

A view of the new and improved EJ Mapping tool. Here’s some good news YEARS in the making, friends: The Pennsylvania Department of Environmental Protection (DEP) released the final Environmental Justice (EJ) Policy - one that is expected to improve environmental safeguards in the Keystone State by enhancing opportunities for public participation and emphasizing proactive community engagement across. The document, which was last updated 20 years ago (!!!) will be used to guide DEP protections for communities most vulnerable to environmental challenges. The news was announced Monday in a press release issued by Gov. Josh Shapiro.  Here’s an excerpt: The updated EJ policy directs how DEP's inspection, compliance, and enforcement efforts can better include criteria and concerns of Pennsylvania communities most at risk from pollution and other environmental impacts. Furthermore, the policy outlines the ways in which DEP plans to increase outreach across Pennsylvania and build long-lasting relationships with communities impacted by environmental challenges. In 2023, DEP announced an interim final policy and collected feedback from communities throughout Pennsylvania. During the extensive comment period, DEP received over 700 comments - GASP’s included. You can get all that background info right here. “It's exciting to see DEP taking this much-needed step. Communities in Pennsylvania's EJ areas carry so much of the burden of environmental hazards, and I am optimistic that these improvements are a step towards changing that,” GASP Environmental Health Manager Rachel Macias said. “Meaningful progress comes from centering community voices in every stage of decision-making to truly achieve equitable outcomes that improve all aspects of health and wellbeing.” Basically, the updated policy will: continue to place a large emphasis on public participation and proactive conversations among DEP’s EJ staff that have been engaging with communities in designated environmental justice areas, based on 32 environmental, health, and socioeconomic indicators.  help those seeking a permit to better understand community concerns.  allow DEP to be more efficient when receiving public comment, improving permitting processes But wait, there’s more: DEP has also updated PennEnviroScreen , a state-of-the-art mapping tool used to identify EJ areas across Pennsylvania, using the most updated data available and the 2020 Census geographical boundaries. The updated version is more user-friendly and includes clearer visual outlines and short data descriptions. We encourage folks to check it out!

As the calendar year draws to a close, Group Against Smog and Pollution (GASP) wants to take a moment to send a huge, heartfelt thank you  to our incredible community of supporters. Because of your passion, dedication, and generous support, we’ve achieved some real breakthroughs this year in the fight for cleaner air and a healthier environment for all. We’ve rallied, we’ve educated, and we’ve stood up to protect our community.  We are so close to the end of the year, and as we look ahead to 2026, we’re setting ambitious goals to tackle new challenges and safeguard the progress we’ve made. To ensure we can hit the ground running on Jan. 1, we need your help. Dec. 31 is the final day  to make a tax-deductible donation  for the 2025 tax year. A gift of any size made before midnight will go directly toward funding our educational, outreach, and ongoing advocacy work in the new year. Want to give an extra boost to your commitment to clean air? Check if your employer offers a matching gift program! Many companies are happy to match their employees' charitable contributions, sometimes doubling or even tripling the impact of your donation—at no extra cost to you!  It's an easy step that can make your tax-deductible gift go significantly further for GASP. Just ask your HR or community relations department for the simple form, and you can truly maximize your support. Whether you’re a long-time member, a new donor, or someone sharing our social media posts, thank you for being a vital part of the GASP family. We wish you a safe and healthy holiday season!