The given line graph illustrates the sources of air contaminants in the UK between 1990 and 2005.
Overall, it can be clearly seen that all indicators of pollution decreased over the period. However, the number of total air pollutants accounted for the highest outcomes, whereas the opposite was true for households.
To begin with, Total air pollutants made up the highest tendency at 7 million tones at the beginning of the period. Consequently, it witnessed a sharp decrease by 3 million tonnes from 1990 to 1999. In 2002, it fluctuated around 4 million tonnes until it dropped to 3 million tonnes at the end of the period. In terms of Industry, it stood at approximately 6 million tonnes in 1990, then it collapsed by roughly 4 million tonnes over the period.
As for transport and households, the number of air pollutants was the same for both of them at the beginning of the period, allocating 1 million tonnes. However, the contribution of transport sources increased gradually over the period and ended up at just above 1 million tonnes last year. In contrast, households were responsible for a minor downward trend from 1993 to 2002, and stood at 0 million tonnes in 2005.