Tests planned on mysterious 'milky rain' in U.S. Pacific Northwest

February 12, 2015 12:58 AM

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PORTLAND, Ore. (Reuters) - Scientists from two U.S. Pacific Northwest laboratories plan to conduct tests of unusual precipitation that fell across the region over the weekend in hopes of pinpointing the origins of so-called "milky rain" that has mystified residents, officials said on Wednesday.

Officials at both the Pacific Northwest National Laboratory and the Benton Clean Air Agency, both in Washington state, said they had collected samples of the rain, which left a powdery residue on cars across a wide swath of the two states.

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