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

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

air

pollution started at around 7

million

and

then

dramatically fell to 4

million

in 1999 and

then

remained nonchanged until 2002. Afterwards, declining roughly 1

million

reaching approximately 3

million

in 2005.

overall

, there was a decreasing rate of

air

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

Likewise

,Households recorded the lowest rate of the total

air

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

air

population.

According to

Industry, started at around 6

million

tones and

then

significantly declined to approximately 2

million

tones.

However

, households began with close to 1

million

then

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

million

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

million

before declining to near zero in the final year.

Moreover

,Transport started with about 1

million

in 1993 and

then

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

million

and

then

fluctuated until reached close to 1.2 or 1.3

million

tones.