Science

EPA Says Volkswagen Dodged Clean Air Rules With Emissions Software

The Environmental Protection Agency is accusing Volkswagen of intentionally dodging clean air rules on nearly half a million vehicles in the U.S. The EPA says Volkswagen installed software called a "defeat device" that only runs full pollution controls during official emissions testing. Under normal driving conditions, the vehicles emit nitrogen oxides at up to 40 times allowable levels, according to the EPA.