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

The previous line graph illustrates the levels of contamination displayed in

micrograms

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per cubic metre across the

years

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1600 to 2000 in the city of London.

Overall

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, it can be clearly seen that

sulphur

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dioxide

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and

smoke

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started with an almost non-existent level of pollution.

However

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, they both showed not only some fluctuation but

also

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growth across the

years

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, especially

sulphur

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dioxide

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which displayed a much higher proportion than

smoke

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.

At the end

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of the period, they both decreased as how they were at the beginning. In detail, in 1600,

sulphur

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dioxide

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and

smoke

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demonstrated a level of contamination of just over 0

micrograms

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per cubic metre.

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However

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However,

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sulphur

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dioxide

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revealed a dramatic increase of around 750

micrograms

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from the

years

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1700 to 1900, the one that completely decreased in the year 2000.

In contrast

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,

although

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smoke

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also

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exhibited some growth over the

years

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(especially a dramatic increase between the

years

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1850 and 1900, showing levels around 275

micrograms

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per cubic metre), it showcased certain fluctuations and

finally

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by the year 2000 it recorded a sharp decrease to around 0%.