The Speck air quality monitor costs $200, but is available to all through Pittsburgh's public library system. Carnegie Mellon University CREATE Lab hide caption

itoggle caption Carnegie Mellon University CREATE Lab

Bayway Refinery in Linden, N.J., is one of two refineries that are involved in the settlement. It's no longer owned by Exxon, but they are on the hook for the cleanup. Joel Rose/NPR hide caption

itoggle caption Joel Rose/NPR

The abandoned Cherokee Clay and Brick Mine in Lee County, N.C., may become a landfill for coal ash. Dave DeWitt/WUNC hide caption

itoggle caption Dave DeWitt/WUNC

Journalist Chai Jing used $160,000 of her own money to produce a documentary on China's air pollution problem. Screenshot/Under the Dome hide caption

itoggle caption Screenshot/Under the Dome

A fisherman collects water on a beach littered with trash at an ecological reserve south of Manila in 2013. Francis R. Malasig/EPA/Landov hide caption

itoggle caption Francis R. Malasig/EPA/Landov

Lynn Good has had many mentors throughout her career — but few of them were women. "So I'm generationally on the early part of the ascent of women into leadership roles," the Duke Energy president and CEO says. Pat Sullivan/AP hide caption

itoggle caption Pat Sullivan/AP

A view of the Tonawanda Coke plant in Tonawanda, N.Y., which was found to have emitted carcinogens at levels many times higher than the state's limit. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

Xiang Zhengming plants rice seedlings in a field in southeast China's Fujian Province earlier this month. A newly released report says nearly 20 percent of the country's farmland is contaminated. Lin Shanchuan/Xinhua/Landov hide caption

itoggle caption Lin Shanchuan/Xinhua/Landov

Exhausts rises from a truck in California last September. Mike Blake/Reuters/Landov hide caption

itoggle caption Mike Blake/Reuters/Landov

Researchers have found that the oft-maligned banana peel can grab heavy metals out of polluted water. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Actor Jessica Alba, accompanied by Sen. Frank Lautenberg (D-NJ), reacts when a buzzer calling for a vote goes off during a news conference on Capitol Hill Tuesday about chemical regulation. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP