Related Clues:

• E.P.A. concern
• City pollution
• Los Angeles woe
• Portmanteau pollution mixture
• Something in the air
• It may be difficult to drive in
• View disrupter
• Cause of an air alert
• Unhealthy air
• It's hard to see through
• Urban problem
• Spring woe, maybe
• Metro-area haze
• Big city problem
• Winter ailment