The line graph gives information about the amount of acid rain emitted from four different sectors, namely transport and communication, electricity, gas and water supply, domestic and other industries in UK from 1990 to 2007. Units are measured in millions of tones (mt).
Looking from an overall perspective, it is readily apparent that all four categories witnessed a downward trajectory in the volume of acid rain released, with the exception of transport and communication group which stabilized in releasing acid rain emissions over the period of 16 years.
At the beginning, three sources supply emitted the highest amount of acid rain among four groups, standing at less than 3.5 mt. By experiencing the greatest change, it decreased the rain emmision to hit a low of 0.5 mt by 2007. The second category is unknown industries with the amount starting at just around 2 mt in 1991. By the end of the period, these industries also reduced the volume of acid rain to 1.25 mt.
In stark contrast, the remaining sectors started to discharge almost the same volume of this type of rain, at just above 0.5 mt in 1991. However, during the given time frame, both of them saw a different trends. At the end, transport and communication category remained at this level despite an unnoticeable growth, while acid rain discharged from domestic sector accounted for the the least amount.