A peer-reviewed study recently published in the journal Environmental Health looked at the air quality near natural gas wells in five states: Arkansas, Colorado, Ohio, Pennsylvania, and Wyoming. In 40 percent of the air samples, laboratory tests found benzene, formaldehyde and other toxic substances at levels above what the federal government considers safe for brief or long-term exposure. In some cases, the levels were far above the safe standards.
Salt has been used to keep winter roads free of ice and snow since the 1940s. It works by lowering the freezing point of water. In the U.S. alone, some 15 million tons of salt is applied to roadways each year. While its use has real benefits, in terms of safety and navigation, there have been cumulative costs to the environment.