According to a piece in Wheels, two-wheelers are actually some of the biggest polluters on the road.

The confusion seems to arise because motorcycles and scooters burn far less fuel than even the most fuel-efficient car or truck. Carbon dioxide emissions are directly proportional to the amount of gas you burn, meaning two-wheelers contribute fewer greenhouse gas emissions per kilometre than their four-wheeled cousins. But that’s only one part of the air quality equation. When it comes to emissions of nitrogen oxide and hydrocarbons – so-called smog-forming pollutants – motorcycles and scooters emit many times more per kilometre than cars and trucks.

No surprise that the days of the two-stroke engine are coming to an end.