The line graph illustrates the levels of air pollution emitted by different sectors in the United Kingdom from 1990 to 2005.
Overall, air pollution from industry, households, and the total emissions experienced a steady decline over the period, while pollution from transport remained relatively constant. The data is measured in million tonnes.
In 1990, the total amount of air pollution stood at approximately 7 million tonnes. It gradually declined to around 4 million tonnes by 1999 and remained relatively stable for the following three years, before falling again to roughly 3 million tonnes by the end of the period. Industrial emissions started just below 6 million tonnes and steadily decreased to about 2 million tonnes by 2005, with a particularly sharp drop from around 5 to 3 million tonnes between 1993 and 1996.
In contrast, both the transport and household sectors emitted approximately 1 million tonnes of pollutants in 1990. While emissions from households declined steadily to nearly zero by the end of the period, with minor fluctuations, pollution from transport remained relatively stable throughout.