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The graph below shows the pollution levels in London between 1600 and 2000.

The graph below shows the pollution levels in London between 1600 and 2000. yM7l

Overall, there were two elements that polluted the air quality in London(smoke and sulphur dioxide). Throughout the period, sulphur dioxide contributed more and more to the pollution level before declined rapidly; however, the rate of smoke experienced a gradual increase and then plummeted at the end. In 1600, sulphur dioxide started to pollute rapidly until the middle of 1700 which were around 750 micrograms after which it declined and levelled off from 1750 to 1800. After that date, this figure rose to reach a peak of around 900 micrograms in 1850 before falling rapidly to almost 5 micrograms in 2000. In terms of smoke, in 1600, this level was about 10 micrograms, after having a gradual increase until 1900, it hit the highest point of under 500 micrograms. Between 1900 and 1950, the rate of pollution made by smoke fluctuated wildly before declined slightly to almost 5 micrograms at the end of the period.

Overall
, there were two elements that polluted the air quality in London(smoke and Possible spelling mistake. 'sulphur' is British English.sulfur
sulphur
 dioxide). Throughout the period, Possible spelling mistake. 'sulphur' is British English.sulfur
sulphur
 dioxide contributed more and more to the pollution level This phrase/word is too simple and can be replaced with:previouslyprior to
before
 declined rapidly
; however
, the rate of smoke experienced a gradual increase and then plummeted at the This phrase/word (depending on the context) can be potentially replaced with :expiration
end
.

In 1600, Possible spelling mistake. 'sulphur' is British English.sulfur
sulphur
 dioxide This phrase/word (depending on the context) can be potentially replaced with :initiated
started
 to pollute rapidly
 until the middle of 1700 which were around 750 micrograms after which it declined and levelled off from 1750 to 1800. After that date, this figure rose to reach a peak of around 900 micrograms in 1850 This phrase/word is too simple and can be replaced with:previouslyprior to
before
 falling rapidly
 to almost 5 micrograms in 2000.

In terms of smoke, in 1600, this level was about 10 micrograms, after having a gradual increase until 1900, it hit the highest point of under 500 micrograms. Between 1900 and 1950, the rate of pollution made by smoke fluctuated wildly
This phrase/word is too simple and can be replaced with:previouslyprior to
before
 declined slightly
 to almost 5 micrograms at the This phrase/word (depending on the context) can be potentially replaced with :expiration
end
 of the period. 