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The above line graph illustrates different sources of air pollutants in the UK between 1990 and 2005.
Overall, the total air pollutants and industry sources depicted a steep decrease in emission, whereas the households and transport sources experienced both an upward and downward trend.
In 1990, the total air and industry pollutants contributed above 4 million tonnes in emission respectively. Both the rates decreased sharply over the period of time reaching nearly 2 and 3 million tonnes in 2005. In the meantime, the total air pollutants reduced to 4 million tonnes in 1999 and remained steady until 2002. During 2002-2005, it experienced a rapid decrease to 3 million tonnes while the industry sources showed from 1990 to 2002 and remained steady till 2005.
In early 1990, the households and transport sources equally contributed in pollution and remained steady until 1993. However, the household sources showed an increase from 1996 – 1999 and then dramatically declined to nearly zero in 2005. In the meanwhile, the transport sources varied linearly till 1999 and experienced a slight increase thereby remaining constant till 2005.
