The graph below shows UK air pollutants, measured in million tonnes,

The line graph illustrates the amount of emissions released into the

air

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from three different sources in the UK from 1990 to 2005.

Overall

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, the total number of

air

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pollutants decreased over the period examined.

This

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change can be attributed to the decline in the level of

air

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pollution in the industry and domestic sectors.

In addition

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, the volume of

air

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pollution emitted from transportation vehicles surpassed the industry sector as the most serious problem from 2002 onwards. In 1990, approximately 8

million

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tonnes

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of hazardous emissions were discharged from all three sectors.

Thereafter

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, it decreased considerably to exactly 5

million

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tonnes

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in 2005. In a similar vein, the figure for the industry sector saw a drastic drop, falling from nearly 6

million

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tonnes

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in 1990 to precisely 2

million

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tonnes

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in the final year. Regarding the amounts of

air

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pollutants caused by transport and households, both of them started at 1

million

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tonnes

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in 1990.

Subsequently

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,

while

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the latter remained at

this

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level until 1999, the former had an upward fluctuation, rising to 1.2

million

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in 1999. From 1999 onwards, the level of toxic gases emitted from the transport sector increased to exactly 3

million

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tonnes

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in 2005 ,

whereas

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the figure for domestic activities declined to 0

million

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tonnes

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in the final year.