Nitrogen in gasoline: Does it cause pollution?

It might seem as if adding nitrogen to gasoline is all the rage among oil companies today, but the idea has been around for years. The US Environmental Protection Agency (EPA) requires that automotive fuels sold in the United States contain detergents to help scrub away pollution before it goes out the vehicle’s tailpipe. Some manufacturers have found that adding nitrogen to the detergent helps keep an engine cleaner by reducing the carbon buildup in the gas tank that can in turn “gunk up” the engine and lower performance.