The line graph compares the amount of emissions released into the air from three different sources, between 1990 and 2005.
Overall, the total number of air pollutants gradually declined over the period shown. While the figures for industry and households decreased over the period, the figures for transport saw an increase.
In 1990, a total of nearly 8 million tonnes of air contaminants were emitted from the three mentioned sources, with the largest figure belonging to industry, at 6 million tonnes. The amount of pollutants due to transport and households were the same, at approximately 1 million tonnes each.
The total number of pollutants discharged into the air gradually reduced over the next fifteen years, with the total figure declining to about 5 million tonnes by 2005. In addition, air pollutants from industrial activity also decreased over time, from just under 6 million tonnes in 1990 to about 2 million tonnes in 2005. Despite the figures for households and transport being equal at the beginning of the period, the quantity of air pollutants from transport saw a small increase to 3 million tonnes by 2005, while air pollutants from households experienced a drop to a negligible amount.