United Press International: Smoke from U.S. wildfires can drift for hundreds of miles and hurt the health of millions, an environmental group says.
A report by the Natural Resources Defense Council, based on smoke data from the 2011 wildfire season -- one of the worst in recent decades -- found the area affected by smoke was 50 times greater than the area burned by fire.
About two-thirds of Americans -- nearly 212 million people -- live in counties affected by smoke conditions in 2011. Many states had large wildfires...