uncontaminated vs unpolluted

uncontaminated and unpolluted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
uncontaminated	No	Yes	No	No
unpolluted	No	Yes	No	No

As adjectives, uncontaminated and unpolluted are synonyms defined as:

uncontaminated and unpolluted: free from admixture with noxious elements; clean

uncontaminated (adjective)	unpolluted (adjective)
not corrupted by contact or association	free from admixture with noxious elements; clean
free from admixture with noxious elements; clean