Related Clues:

• Urban pollutant
• Sooty sunblocker
• Urban hazard
• Urban pollution
• Haze
• Industrial pollutant
• Visibility problem
• Air pollutant
• Cough cause
• Big city haze
• It might hang over your head
• It might make you short of breath
• Los Angeles bane
• Urban pall
• It may be thick in Houston