There are three types of motorcycles. They are the street bikes, the off-road bikes and dual purpose bikes. Street bikes are further categorized as cruisers, mopeds and scooters amongst others. The off road motorcycles are not for the roads but specifically for racing. The dual purpose motorcycles are used for racing and have also features that permit it to be used on the roads.

Automobile pollutions have become unbearable in many cities. Traffic snarls are a daily occurrence. This makes motorcycles a favorite amongst vehicles. It has a lower carbon emission. Its fuel efficiency is much higher than other vehicles that take to the road. Its smaller mass is the reason for its better fuel economy. Motorcycles emit lesser greenhouse gas as compared to cars. But its pollution level per mile is ten times and could even reach up to twenty times as compared to the pollution level of cars. Motorcycle emits nitrogen oxide. This is produced as a byproduct of combustion. Nitrogen oxide is a major component of smog. It is the lower efficiency of its catalytic converter that causes nitrogen oxide to be produced.

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