Chemical symbol: SO2
How it is formed
Sulfur dioxide can be formed from both natural and human activities. Natural processes include decomposition and combustion of organic matter; sea spray and volcanic eruptions. The main human activities are smelting sulfur-containing mineral ores and fossil fuel combustion
Some interesting facts
Sulfur dioxide dissolves in water to form sulfuric acid, a corrosive substance that damages materials and plant and animal tissue. Acid rain, a serious environmental issue worldwide, can harm historic buildings, forests and lakes.
How it can affect us
Sulfur dioxide irritates airways of the lungs - people with asthma who are physically active outdoors are most vulnerable. Effects may include wheezing, chest tightness, and shortness of breath.