unpolluted vs uncontaminated

unpolluted and uncontaminated both are adjectives.

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

As adjectives, unpolluted and uncontaminated are synonyms defined as:

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

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