The graph below shows UK air pollutants, measured in million tonnes, from three different sources between 1990 and 2005. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The line graph displays the

amount

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of toxic

air

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released into the environment in the UK from three various sources in a three-year interval between 1900 and 2005.

Overall

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, the total

amount

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of

air

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contaminants in the UK witnessed a downward trend, which was the result of decreases in the amounts of emissions from industrial and domestic activities.

In addition

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, the

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amount

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number

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of

air

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pollutants emitted from transport vehicles saw an increase, surpassing the industry sector to become the most serious polluter from 2002 onwards. In 1990, about 8

million

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tonnes of

air

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pollutants from all three sectors were discharged into the environment, which was higher than that from the industry category, at nearly 6

million

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. By 2005, their figures plummeted to 5

million

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and 2

million

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, respectively. The

amount

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of toxic fumes released from the transport and household sectors stood at the same level, with each accounting for 1

million

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tonnes at the beginning of the period. During the next nine years, the former fluctuated slightly to 1.2

million

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in 1999 before soaring to 3

million

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in 2005. Meanwhile, the latter remained unchanged until 1999

,

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but

then

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fell to almost 0 in 2005.