“Soil pollution” refers to the presence in the soil of a chemical or substance out
of place and/or present at a higher than normal concentration that has adverse
effects on any non-targeted organism. Soil pollution often cannot be directly
assessed or visually perceived, making it a hidden danger.

The Status of the World's Soil Resources Report (SWSR) identified soil pollution
as one of the main soil threats affecting global soils and the ecosystems services
provided by them.