Related Clues:

• Etna output
• Air pollution
• Chimney output
• Grayish
• E.P.A. concern
• City pollution
• Wood for a 61-Down
• Los Angeles woe
• Hot flick?
• 'Red' or 'white' tree
• Grate stuff
• Fire sign
• Portmanteau pollution mixture
• Olive kin
• Combustion residue