Related Clues:

• Industrial pollutant
• Visibility problem
• Air pollutant
• Atomizer's release
• Cough cause
• Big city haze
• Navigation hindrance
• Naviga-tion hindrance
• It might hang over your head
• It might make you short of breath
• Confused state
• Navigation hazard
• Los Angeles bane
• Urban pall
• It may be thick in Houston