Creeping into the Fort Pitt Tunnel, angling for space at the Parkway East’s Grant Street exit, or elbowing into a gap in traffic on the Veterans Bridge, tens of thousands of people drive or ride into and out of Downtown nearly every day.

Power companies aren’t alone in their shift away from coal. Steelmakers, industry groups and the federal government are spending millions looking for a way to make steel without coke, the carbon-​rich form of coal used to fuel blast furnaces. Like coal-​fired power generation, coke production is a major source of air pollution, and…

As their due date neared last fall, Ryan Poling and his wife faced a difficult decision. Did they want to raise their daughter in Pittsburgh, the city in which they’ve built a life during the last nine years, or pick up and move across the country, near Poling’s family in California?

Although the region’s air has improved dramatically from the height of Pittsburgh’s industrial past, southwestern Pennsylvania remains home to factories and power plants that release millions of pounds of toxic chemicals into the air. The U.S. Environmental Protection Agency uses Toxic Release Inventory (TRI) data to track toxic chemicals released into the air,…