The vehicles in our fleet produce 97 percent less hydrocarbon and oxides of nitrogen emissions than vehicles that meet today's nationwide top emissions standard. (driverseddirect.com)
In the mid-1980s, the company teamed up with another, Lean Burn Associates, to add a second component: a system which recirculates some exhaust gases into the air intake, which reduces emissions of oxides of nitrogen. (newscientist.com)
Automobiles, power plants and industries release oxides of nitrogen into the atmosphere. (religion-online.org)