The provided line graph illustrates the amount of nitrogen oxide output produced by four different vehicles.
Overall, it is clearly seen that nitrogen oxide emissions produced by diesel and petrol cars witnessed slight changes, whereas the same output of lorries and buses experienced major changes.
Firstly, buses produced 40g/km of nitrogen oxide at speed 10 kph. Moreover, this production declined significantly to produce nearly 26 g/km of nitrogen oxide at 60 kph. The emissions witnessed a surge increase and reached almost 42 g/km of nitrogen oxide at 130 kph. Turning to lorries, gas emissions declined steeply to hit around 17 g/km of nitrogen oxide at speed 90 kph, before experiencing a marked increase to score roughly 24 g/km at 130 kph.
Secondly, petrol cars nitrogen oxide production fluctuated slightly. While they produced approximately 10 g/km of gases at speed 10 kph, the output had raised to about 11 g/km of gases by speed 130 kph. However, nitrogen oxide emission produced by diesel car was roughly 7 g/km at speed 10 kph, before witnessing a period of stability at 5 g/km.