Related Clues:
- A thin mist, perhaps from heat
- Mist, light fog
- A mixture of smoke and fog
- Dirty mixture of smoke and fog
- 'Mist, light fog (4)'
- "Purple ___" (Hendrix)
- Skyline-blurring phenomenon
- Atmospheric aggregation
- Initiate, maybe
- Urban miasma
- Type of air pollution
- Subject of an exhaustive E.P.A. study?
- Urban bane
- EPA topic
- Houston problem