Test 2: Nitrogen produced by four vehicles

You should spend about 20 minutes on this task

The given graph shows the nitrogen oxide emission produced by four vehicles. Summarise the information by selecting and reporting the main features and comparisons where relevant.

Write alteast 150 words.

The line graph depicts the information about release of nitrogen oxide generated by diesel cars, petrol cars, lorries and buses. The data has been calibrated in grams/kilometre.

Turning into details, lorries and buses discharged about 32 g/km and 40 g/km of nitrogen oxide, while at the moving speed of 10 km/hr. This number declined gradually for both lorries and buses until the speed of 90 km/hr and 60 km/hr respectively. In case of lorries, the outflow of nitrogen oxide rose moderately as the speed increased from 100 km/hr to 130 km/hr. Surprisingly, in buses, the number escalated dramatically  and composed at 42 g/km as the speed surged from 70 km/hr to 130 km/hr.

Probing into deeper details, diesel cars and petrol cars produced less nitrogen oxide comparatively. Both the vehicles showed almost similar trend starting from 7 g/km and 11 g/km at the speed of 10 km/hr separately. Interestingly, it stabilized and comprised 5 g/km in case of diesel cars, and on the other hand, it stood between 9-11g/km subjected to petrol cars, as the speed accelerated from 20 km/hr until 130 km/hr.

Overall, it can be seen that lorries and buses produced maximum quantity of nitrogen oxide as compared to diesel and petrol cars.

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