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

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

Overall

, throughout the time the data has shown that

levels

of contamination in general terms had decreased.

However

, only transportation has not decreased the production of

pollution

. In the 90's

levels

of

pollution

reached the highest rates. But,

at the end

of

this

decade, the

levels

started to go down considerably.

Firstly

, to be more specific in 1990 the rates of total

pollution

were over 6 million tonnes, and

this

number was very high,

due to

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

this

figure dropped sharply, reaching almost half of the

levels

, and continued to decline steadily until 2005.

In addition

, in 1990 transportation

as well as

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

pollution

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