UPDATED: Several More H2S Exceedances for Mon Valley as Poor Air Quality Lingers
Editor’s Note: This story was updated at 3:51 p.m. Monday to include today’s exceedances at the Liberty and North Braddock air quality monitors. High concentrations of hydrogen sulfide (H2S) in the Mon Valley led to exceedances of the state standard on Saturday and Monday at the Allegheny County Health Department’s air quality monitoring sites in Liberty and North Braddock. For the uninitiated: Hydrogen sulfide is a colorless gas most commonly recognized by its “rotten egg” s