ultraviolet index in Mad River Slough (Arcata Bay) (13 mi.) | ultraviolet index in Arcata Wharf (14 mi.) | ultraviolet index in Samoa (16 mi.) | ultraviolet index in Eureka Slough Bridge (17 mi.) | ultraviolet index in Eureka (17 mi.) | ultraviolet index in Bucksport (19 mi.) | ultraviolet index in North Spit (Humboldt Bay) (20 mi.) | ultraviolet index in Elk River Railroad Bridge (21 mi.) | ultraviolet index in Fields Landing (23 mi.) | ultraviolet index in Hookton Slough (26 mi.) | ultraviolet index in Crescent City (48 mi.)