Related Clues:

• Sun block
• Harass, in a way
• 'Purple ___' (song played at Woodstock)
• Visibility lessener
• Part of many a summer forecast
• Smoky mist
• Demean, as pledges
• Skyline obscurer
• Some confusion
• Visibility hindrance
• Smog consequence
• Visibility problem
• Navigation hindrance
• Confused state
• Navigation hazard