Related Clues:
- Return manuscript with green light for air pollution
- Portmanteau that, when heavy, hampers driver
- Emissions consequence
- Los Angeles haze
- Cause of a bad air day
- Polecat produces foul air
- San Joaquin Valley concern
- Beijing environmental issue
- An EPA concern
- Suffocating blanket
- What can take your breath away in L.A.?
- Urban pollution problem
- Industrial-zone feature
- Flaw in a road surface
- Photochemical phenomenon