4x4s cleaner than standard cars in latest Equa Air Quality NOX ratings
The latest Equa Air Quality (Aq) Index shows assumptions that two-wheel-drive vehicles are cleaner than four-wheel drives are wrong. Comparing two and four-wheel-drive test results reveals that the more capable models produce less nitrogen oxides when compared through real, on-road driving. Concentrating on the latest Euro 6 compliant vehicles, it shows the vast improvements that some manufacturers have made in helping cut harmful tailpipe emissions when developing new cars.