Related Clues:

• Urban blights
• City palls
• Air pollutants
• Suffocating blankets
• Urban palls
• Urban pollutions
• Clean Air Act targets
• Bad air conditions
• Obscures, with ''up''
• Urban woes
• They are smoky and foggy
• L.A. hazes
• Visibility lesseners
• Causes of bad air days
• Unhealthy blankets