Band 9: The graph below shows different sources of air pollutants in the UK from 1990 to 2005. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The line chart compares the amounts of air contaminants from industry, transport, and households in the UK between 1990 and 2005.

Overall, all studied emission sources witnessed a marked decline in air pollution levels, which correlated with decreased total outflow of atmospheric pollutants, while transport saw a reverse trend. It is also noteworthy that industry consistently remained the dominant source of air contaminants throughout the surveyed period, though its numbers experienced a significant fall.

In 1990, total air pollutant emissions in the UK amounted to just north of 7 million tonnes. By 1996, this figure dramatically dropped to approximately 4.5 million tonnes, before exhibiting another decline to over half of its initial level after 9 years. Following an identical trajectory, the industry sector witnessed its air pollutant level falling from about 5.5 million in 1990 to an exact 2 million tonnes by 2005.

In contrast to remarkable changes observed in industrial air pollution, transport air pollutants paled in significance. For the majority of the period, this sector released around a million tonnes of pollutants into the air every year, establishing itself as the second biggest air polluter by 2005.

Turning finally to households, its initial level of air pollution was similar to that of tailpipe emission, however, the former saw a moderate fluctuation below one million tonnes until 1999. From this point onwards, the amount of air pollutants from households gradually reduced, dwindling to almost negligible by the end of the given period.