The graph below shows UK acid rain emissions measured in millions of tonnes from four different sectors between 1990 and 2007

Overall, it can be seen that this graph suffered from a downward trend. Besides, while Electricity, Gas and Water Supply experienced a sharp reduction, Domestic appeared to have a slightly decreased.
First of all, starting at 3. 3 million tonnes in 1990, the figures of Electricity, Gas and Water Supply declined dramatically by 1. 5 million tonnes in 1997, which was one and a half the first statics. Then, the number had a slight fluctuation and reached 0. 5 in 2007. Besides, Other industries decreased remarkably from 1993 to 2005 and remained stable until the end of the period.
Next, Domestic remained unchanged in the first 4 years with 0. 6 million tonnes and fell gradually to 0. 2 in 2005. Meanwhile, Transport and communication fluctuated through the period, it reached the peak of 1 million tonnes in 2005 and dropped moderately to 0. 7, which was as same as in 1990.