Clue: Air quality problem

Answer: SMOG

Length: 4

---

Similar Clues:

• Problemless quality (EASE with 4 letters)
• Problem at the airport (DELAY with 5 letters)
• Airline once said to be "ready when you are" (DELTA with 5 letters)
• Fla. airport (MIA with 3 letters)
• Telltale quality (ODOR with 4 letters)
• Aired anew (RERAN with 5 letters)
• Test an airplane again (REFLY with 5 letters)
• Airsleep company (SERTA with 5 letters)
• Spartan quality (COURAGE with 7 letters)
• Aircraft at Orly (AVION with 5 letters)