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 chart illustrates how Sulphur dioxide and smoke contributed to the pollution levels in London for the year 1600 to 2000. Pollution has been on the rise

during

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for

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the

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three centuries since 1600.

Although

in the years between 1750 and 1800 Sulphur's level dropped down under 750 micrograms/cubic meter, it showed a modest gain reaching

near

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nearly

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900 after that. Meanwhile, smoke levels show a steady increase in the same time frame.

However

, there was a clear large gap between

values

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the values

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of both measures in the years before 1900.

Moreover

, the two trends show a drastic decrease after the year 1900 declining from almost 750 to

near

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nearly

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0 by the beginning of 2000.

According to

the chart, values are decreasing slowly in a fluctuating pattern

in

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approximately

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70 years before the end of the time frame.

In addition

, both quantities reach 250 micrograms around the year 1950.

Overall

, Sulphur dioxide had a higher impact on London's air than smoke did.