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

per cubic metre across the

years

1600 to 2000 in the city of London.

Overall

, it can be clearly seen that

sulphur

dioxide

and

smoke

started with an almost non-existent level of pollution.

However

, they both showed not only some fluctuation but

also

growth across the

years

, especially

sulphur

dioxide

which displayed a much higher proportion than

smoke

.

At the end

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

sulphur

dioxide

and

smoke

demonstrated a level of contamination of just over 0

micrograms

per cubic metre.

However

Add a comma

However,

show examples

sulphur

dioxide

revealed a dramatic increase of around 750

micrograms

from the

years

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

In contrast

,

although

smoke

also

exhibited some growth over the

years

(especially a dramatic increase between the

years

1850 and 1900, showing levels around 275

micrograms

per cubic metre), it showcased certain fluctuations and

finally

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