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

of toxic

air

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

Overall

, the total

amount

of

air

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

, the

amount

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of

air

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

tonnes of

air

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

million

. By 2005, their figures plummeted to 5

million

and 2

million

, respectively. The

amount

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

million

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

million

in 1999 before soaring to 3

million

in 2005. Meanwhile, the latter remained unchanged until 1999

,

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but

then

fell to almost 0 in 2005.