The line graph illustrates the various sources of air pollutants in the UK between 1990 and 2005.
Overall
, most causes of pollution faced a downward trend except for transport.
On taking a closer look, industries are a major contributor of toxins by almost six Linking Words
million
 tonnes Use synonyms
while
 transport and households contribute only one Linking Words
million
 Use synonyms
ton
 in the year 1990. Since Fix the agreement mistake
tons
then
 both industrial and household Linking Words
pollutions
 have dropped dramatically Fix the agreement mistake
pollution
also
 toxins produced by transportation have risen a little bit Linking Words
in 
over the period of fifteen years.
By probing Change preposition
apply
further
, the total emissions have dropped from seven Linking Words
million
 tonnes to around five Use synonyms
million
 tonnes which indicates that on average the population of the UK are producing less pollution now than they previously did. Use synonyms
On the other hand
, transport and households Linking Words
emmited
 the same amount of emissions Correct your spelling
emitted
initially
  but as time progressed one, transportation, went down Linking Words
while
 the other, household, went up.Linking Words