The graph below shows UK air pollutants in millions of tons, from three different sources, between 1990 and 2005.

The chart illustrates the number of

air

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pollutants from three resources between 1990 and 2005 in the UK.The units are measured in millions of tons. The total

air

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pollution started at around 7

million

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and

then

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dramatically fell to 4

million

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in 1999 and

then

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remained nonchanged until 2002. Afterwards, declining roughly 1

million

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reaching approximately 3

million

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in 2005.

overall

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, there was a decreasing rate of

air

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pollution over the period. In terms of Industry, it experienced the highest proportion of pollution compared with other resources.

Likewise

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,Households recorded the lowest rate of the total

air

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population. The transport system was considered the second factor of a higher

air

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population.

According to

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Industry, started at around 6

million

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tones and

then

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significantly declined to approximately 2

million

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tones.

However

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, households began with close to 1

million

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then

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showed a stable period until 1993 before a slight decrease to nearly 0.5

million

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tonnes in 1996. There was a small rose until reached about 1

million

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before declining to near zero in the final year.

Moreover

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,Transport started with about 1

million

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in 1993 and

then

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experienced a steady increase until reach a peak of more or less than 1.1

million

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and

then

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fluctuated until reached close to 1.2 or 1.3

million

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tones.