Related Clues:
- Sunset obscurer
- Metropolitan visibility problem
- Hindrance to visibility
- Urban eye irritant
- Unwanted blanket
- Industrial portmanteau
- Layer over some cities
- City choker
- Paddle at a 24-Across, perhaps
- Small feline in urban haze
- Gray skies, maybe
- Unclarity
- Smoky obscuration
- Low-visibility condition
- Reason to clear the air?