▶ Your Answer :
The line graph illustrates the numbers of two factors, including sulphur dioxide and smoke, of pollution in London, measured in micrograms per cubic metre, from 1600 to 2000.
Overall, it is apparently seen that sulphur dioxide had been continuously a higher pollutant than smoke during the period shown. In addition, the figure for both causes mainly had increased until about 1990, but they steeply decreased to the end of period.
As shown by the graph, between 1550 and 1600, the pollution level was very low, nearly zero, but the amount of that gradually increased until 1725 by just over 750 micrograms and under 250 micrograms in sulphur dioxide and smoke repectively. After then, ehile the number of sulphur dioxide dramatically dropped in 1750, that of smoke showed mere decrease and jumped to 400 micrograms in 1900.
In terms of the remaining years, the level of sulphur dioxide reached a peak at approximately 950 micrograms in 1850, and sharlply declined to the zero with some fluctuation. Similarly, smoke levels peaked around 450 micrograms in 1900 and went down with big fluctuation.
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