The graph below shows the pollution levels in London between 1600 and 2000. Summarize the information by selecting and reporting the main features and make comparisons where relevant.

The given line graph illustrates the

level

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of contamination in London measured by

micrograms

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per cubic

meter

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over the course of 400 years starting in 1600. Looking at the graph, it is immediately obvious that both pollutants have experienced dramatic variation throughout the time frame.

Overall

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, the amount of Sulphur dioxide emitted always appeared to be higher compared to the proportion of smoke. In 1600, the

level

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of pollution was relatively low, but in the

next

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hundred years, London witnessed a sudden increase in both contaminated gas with Sulphur dioxide skyrocketed to 700

micrograms

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per cubic

meter

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,

while

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the

level

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of smoke slightly increased to about 200

micrograms

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per cubic

meter

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. Over the

next

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two centuries,

Sulphur

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the Sulphur

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dioxide emission rate continued to increase and managed to reach a peak at roughly 900

micrograms

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per cubic

meter

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in 1850 despite some fluctuations in

this

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period. In the meanwhile, the

level

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of smoke

also

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experienced a gradual growth and reached the highest figure at approximately 500

micrograms

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per cubic

meter

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around 1900. In the

next

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ten decades,

however

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, both pollutants fluctuated dramatically and eventually plunge to the bottom with zero

micrograms

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per cubic

meter

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registered.