Related Clues:

• Unhealthy air
• It's hard to see through
• Window treatment
• Victorian fashion accessory
• Gown's go-with
• See 9-Across
• See 11-Across
• Winter accessory
• Urban problem
• Stadium souvenir, perhaps
• See 4-Across
• 'Waiting for Godot' prop
• Magician's prop
• Eye shade
• Metro-area haze