Related Clues:

• Air pollution
• E.P.A. concern
• City pollution
• See 9-Down
• Los Angeles woe
• Dreamy state
• Portmanteau pollution mixture
• Cause of low visibility
• Something in the air
• It may be difficult to drive in
• Fog
• ''Purple ---'' (rock classic)
• Part of a summer forecast
• View disrupter
• Contrail's makeup