Related Clues:

• London ___
• 'Purple ___' (song played at Woodstock)
• View hider
• Visibility lessener
• Part of many a summer forecast
• It may make the nose wrinkle
• Harbor hazard
• Smoky mist
• Big stink
• Dumpster emanation
• Demean, as pledges
• Skyline obscurer
• Some confusion
• Mariners' menace
• Famous London weather phenomenon