The Valley floor is about 4,000 ASL, which is enough to increase UV radiation. The moisture and morning smoke (some mornings there are worse than LA) will add a cast as well. Ye ole Ektachrome also has that blue cast. A warming filter with any color would be an advantage. Personally, I like the darker skies if only to make the snowy peaks standout. I used a polarizer most of the time.
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