The graphs illustrate the group's use of resources and emissions to water and air during the past five years.
COD is a measure of organic substance in waste water. Substances included in the COD parameter consume oxygen when they break down.
Nictric and phosphorous compounds are nutritive salts that contribute to an excess of nutrients.
Nitrogen oxides are a group of gases formed during combustion that contribute to acidification and an excess of nutrients.
Emissions of sulphur compounds comprise sulphur dioxide, hydrogen sulphide and various organic sulphur compounds.
