#airqualityexceedance

Blog Against Smog

<UPDATED> More H2S Exceedances at Liberty, Mon Valley Residents Report Stench

Editor’s Note: This blog was updated at 10:35 a.m. Feb. 23 to include an updated H2S chart. Users of CMU CreateLab’s crowd-sourcing app...

The Mon Valley Stinks (Literally): Sky-High H2S Concentrations Cause Air Quality Exceedances

Editor’s Note: This story was updated at 9:25 a.m. on Thursday, July 29 to include additional information about an air quality exceedance...

Another Weekend, Another H2S Air Quality Exceedance for Mon Valley

The average concentration yesterday was 0.006 ppm, according to preliminary health department data. The state 24-hour standard is 0.005...

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...

Yet Another Air Quality Exceedance in Mon Valley, as Area (Again) Experiences Worst AQI in Nation

It’s official: The Mon Valley will experience yet another air quality exceedance today according to preliminary data from the Allegheny...

Thursday Marked Fourth Straight Day of Hydrogen Sulfide Exceedances in the Mon Valley

The values in red denote exceedances of PA’s 24-hour H2S standard of 0.005 ppm. Thursday marked the fourth straight day of air quality...