The given graph illustrates the proportion of nitrogen oxide emissions that produced by four transportations.
Overall,it is obvious that buses produce a range of percantage of all nitrogen oxide emissions;meanwhile larries take the second place by producing nitrogen oxide.But,petrol and diesel types of car’s nitrogen oxide producing pretty similar.
With regards to buses,this kind of automobile creat an enourmous proportion of nitrogen oxide by speed of 130,this just under of 45 g/km and there we can clearly see a decrease of nitrogen production down to 25 g/km at the speed of 60,however,after that we see a sharply increase up to 45 g/km at the speed of 130.While,larries nitrogen oxide producing dramatically fall down to just under 20 g/km by the speed of 90,although after this indicator we see a rise up to 25 g/km by the speed of 130.
With regards to petrol car, comparison to the first ones,there we cannot see any changes over all of speed indicators,the maximum producing of nitrogen oxide there details 10 g/km and minimum is also 10,however the producing of nitrogen oxide in petrol cars still bigger than in diesel cars where the maximum producing shows just under of 5 g/km and minimum is exactly 5g/km.