noun
ADJECTIVE
▪ serious , widespread
▪ possible , potential
▪ environmental , food , soil , water
▪ bacterial , chemical , radioactive
… OF CONTAMINATION
▪ level
▪
There is already a high level of environmental ~.
VERB + CONTAMINATION
▪ cause
▪ avoid , prevent
▪ minimize ( esp. AmE ), reduce
PREPOSITION
▪ ~ by
▪
Always keep food covered to prevent ~ by flies.
▪ ~ from
▪
There is a danger of serious ~ from radioactive waste.
▪ ~ with
▪
Wash everything thoroughly to avoid ~ with bacteria.
PHRASES
▪ a risk of ~
▪ a source of ~