**2.4. Sulphur dioxide (SO2)**

Sulphur dioxide (SO2) is emitted by the combustion of fuels containing sulphur. It contributes to acid deposition and can cause adverse effects on aquatic ecosystems in rivers and lakes, and damage to forests.

Sulphur dioxide (SO2) is a highly reactive gas. SO2 is emitted mainly by fossil fuel combustion by power plants (73%) and other industrial process (20%). Smaller sources of SO2 are released by other industrial processes such as mineral extraction and also by the burning of highsulphur fuels. Many illnesses are related to SO2; particularly, harmful effects are linked to the respiratory system.
