The line graph compares three different sources in terms of the millions of tonnes of air contaminants in the UK from 1990 to 2005.
Overall, there was an incline in the amount of air pollutants discharged by transport, while the opposite trend can be seen for the figure of the remaining sources. In addition, it is noticeable that the quantity of air impurity for total sources was generally the highest throughout the given period.
As for leading air pollutants production, the quantity of air poison tonnes for total source started at around 8 tonnes in the first year, after which it experienced a constant decrease and ended at about 6 tonnes in 2005. Similar change, but to a lesser extent, can be seen in the figure for industrial activities, which declined tremendously from around 6 tonnes in 1900 to exact 2 tonnes in the final year.
Regarding the remaining resources, the tonnes of air harmful substances produced by family units stayed stable at 1 tonnes from the first year to 1999, before progressively reducing to the lowest point at 0 tonnes in 2005. Starting at the same figure for households, the air pollutant tonnes discharged by transport fluctuated during the period of 9 years, followed by a significant growth to 3 tonnes in the final year.