The three sources of fumed gases polluting the air in the UK in the period of 1990 to 2005 is compared in the given line chart.
Overall , it is abundantly clear that during the 15 years , total air pollutants were decreased . While the majority of greenhouse gases were originated from industry in the entire survey , households were minor responsible for producing these contaminants.
If we look at the total air pollutants , we can see that in 1990 seven million tonnes of pollutants were emitted into the air . Although this amount was remained almost stable from 1990 to 2002 , the figure reached to about the half of the initial amount (to about 3.5 million tonnes) . The industry was the main sector which produced the main fumed gases , with almost 5.5 million tonnes in 1990 . From 1993 to 1996 , the number significantly decreased to about three million tonnes , and then countinued to dip slowly to the final two million tonnes.
Looking at the domestic sectors , we observe that the figure fluctuated between just below one and just above zero . However , in the whole study , the gases , releasing from transport sectors , was remained unchanged at account one million tonnes .