Group Against Smog & Pollution

This marks the 46th day of 2021 when H2S exceeded that standard at the Liberty monitor.

There have been 45 such exceedances at the Liberty monitor and 17 more at North Braddock.

For the third day in a row, hydrogen sulfide (H2S) levels were so high Tuesday that an exceedance of PA's 24-hour average was guaranteed.

Allegheny County Health Department (ACHD) Sunday morning issued a Mon Valley Air Pollution Warning.

GASP attended the Allegheny County Board of Health meeting Wednesday to once again request that officials provide an update to the public...

GASP on Wednesday implored the Board of Health to do what they could to increase transparency over the Edgar Thomson enforcement.

GASP is formally calling on EPA to provide to the public a substantive update on what improvements will be required of U.S. Steel.

There have been 33 exceedances of the H2S standard in the past seven months at the Liberty air quality monitor and 12 at North Braddock. 

Allegheny County experienced its 27th H2S exceedance of the year Friday when concentrations exdeeded PA's 24-hour average standard.

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...

Smell something foul in your neighborhood? If you live in the Mon Valley that’s probably a resounding, “YES.” Terrible air quality has...