Related Clues:

• Houston bane
• Clue for a car mechanic
• It's not in the library often
• Annoying sound
• Sleep preventer
• It may be thick in L.A. or Houston
• Airport hazard
• Really bad music, to the listener
• Unhealthy urban haze
• Librarian's bane
• It's often made to get attention
• Subject of an alert
• Sleep threatener
• Loud sound
• Feature of city life