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UPDATED: Rotten Egg Stench Persists in Mon Valley as Liberty Experiences More Air Quality Exceedances

Editor’s Note: This story was updated at 11:05 a.m. on 10/20 to include information on today’s H2S exceedances and again at 11:35 a.m. 10/21 with an updated data chart.

Sorry, Mon Valley friends, but you won’t get a reprieve today from the tell-tale rotten egg stench associated with hydrogen sulfide: Concentrations of the stinky air pollutant have been so high at Allegheny County Health Department’s air quality monitors in Liberty and Braddock boroughs that exceedances of the state standard are already guaranteed.

Concentrations of hydrogen sulfide also exceeded Pennsylvania’s air quality standard at both the Liberty and Braddock monitors yesterday.

That means that there has been 14 such exceedance at the Braddock air quality monitor so far this year and 39 at Liberty.

GASP is again imploring the health department to keep residents in the know about these ongoing exceedances, what’s causing them, and what is being done to address them.

“These H2S exceedances happen far too often for the health department to continue to stay mum on the matter,” GASP Executive Director Patrick Campbell said. 

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