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Douglas Harper's Etymology Dictionary
unpolluted

c.1600, from un- (1) "not" + past participle of pollute (v.).

Wiktionary
unpolluted

a. Not polluted; uncontaminated

WordNet
unpolluted

adj. free from admixture with noxious elements; clean; "unpolluted streams"; "a contaminated lake" [syn: uncontaminated]

Usage examples of "unpolluted".

Closing his eyes, he inhaled deeply of the brisk, unpolluted air, its innate refreshingness enhanced by the extra oxygen being pumped out by the forest.

Save for a few Xican coelenterates that had been stranded on the beach by high tide, the sands were as unblemished as the mind of an embryo, washed pure by an unpolluted sea.

It struck me as so entirely within the limits of probability that I sent at once for Franzia and Capitani, and in the presence of the unpolluted virgin I told them that I had obtained from the seven spirits watching over the treasure all the necessary particulars, but that I had been compelled to enter into an agreement with them to delay the extraction of the treasure placed under their guardianship.

And so, with a good dose of fan appreciation as appetizer, the ever-environmentally aware Barky settled right down with a medium-rare prime vege-rib and seemed as happy as a clam in unpolluted water.

I supply the salad bars of wealthy twenty-fourth-century vacationers, who pay out a considerable chunk of their income to be herded into cramped shuttles and thrown back through time to an unspoiled and unpolluted paradise where they can sportfish, have their holos taken with dwarf woolly mammoths, or just relax by the pool.

Gentle pressure pushed Flinx back in his seat as the scramjets shoved the ship high into Samstead's relatively unpolluted upper atmosphere.