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

The line graph illustrates three different sources where

pollution

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was generated in the UK and the general quantity produced, between 1990 and 2005.

Overall

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, throughout the time the data has shown that

levels

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of contamination in general terms had decreased.

However

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, only transportation has not decreased the production of

pollution

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. In the 90's

levels

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of

pollution

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reached the highest rates. But,

at the end

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of

this

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decade, the

levels

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started to go down considerably.

Firstly

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, to be more specific in 1990 the rates of total

pollution

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were over 6 million tonnes, and

this

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number was very high,

due to

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the factories, which it was causing at least 90 % of the total contamination sources with more than 5 million tonnes. But, in 1993,

this

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figure dropped sharply, reaching almost half of the

levels

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, and continued to decline steadily until 2005.

In addition

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, in 1990 transportation

as well as

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contamination produced by houses were very low, they just reached 1 million tones of

pollution

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rates. Even though, both of them have had some fluctuations through the chart both were very stable until 2005.