Ed Duffy gives us a history lesson on Philadelphia’s 150-year-old oil industry following the explosion, fire, and pending closure of Philadelphia Energy Solutions’ oil refinery in Southwest Philly

How safe is safe enough? Environmental researcher Coryn Wolk explores the potential public health risks at a youth baseball field built on top of an industrial alloy production site surrounded by an oil refining complex

As 150 million gallons of highly flammable crude oil travels through Philadelphia each week, some fear we are overdue for another large-scale disaster. Coryn Wolk steps back to view the current conflict between public safety and reclamation of the Schuylkill and Delaware River waterfronts and the city’s booming oil industry.

As Will Bunch reveals in his Daily News report today, the increasing rail transport of crude oil through the city may be a threat to public safety. In this investigation, Hidden City contributor Christopher Dougherty explores Philadelphia’s dangerous history with oil refining and transport—and contemporary industry changes that are putting increased pressure on local infrastructure