The Environmental Protection Agency has finalized new health standards for one kind of air pollution. Lester Graham reports.
Most of us are used to living within an extended, urban life-support system dedicated to keeping us safe.
A fleet of kayaks and canoes gathered around the convergence of Pittsburgh's three rivers to break a world record-- because we are a
We don't usually see what goes into cleaning up streams from the polluted water pouring out of the area's many abandoned mines. But visitors can now walk around a series of artfully designed restoration ponds at a forested property south of Pittsburgh.
Health effects of one the most toxic types of chemicals are being reevaluated by federal scientists.