Related Clues:
- L.A.'s haze
- Sight inhibitor, often
- L.A. issue
- One kind of pollution
- Threat to peace?
- Exhaust issue
- Cause of some urban coughs
- Sleep inhibitor
- 2007 Tim Robbins vehicle about sonic pollution
- Air woe watched by the EPA
- Visibility obstructer
- Urban health problem
- Freeway byproduct
- Symptom for a car mechanic
- Boom, vroom, zoom, etc.