Air Quality Concerns Linger After Explosion

Allegheny County is increasing air quality monitoring after an explosion at a U.S. Steel plant south of Pittsburgh killed two people and injured more than 10 others. The county announced Thursday that mobile air units from the state and Carnegie Mellon University will be stationed in the Mon Valley. These measures are part of an ongoing investigation into the explosion at Clairton Coke Works on Monday. The plant has a history of environmental issues, including a 2018 fire that led to repeated releases of sulfur dioxide. The facility is the largest coking operation in North America.