Pollution in city skies
I believe the answer is:
smog
(Other definitions for smog that I've seen before include "Smokey fog" , "Pollution haze/fog" , "Smoky haze" , "Dirty mixture of smoke and fog" , "Thick polluted mist" .)
I believe the answer is:
smog
(Other definitions for smog that I've seen before include "Smokey fog" , "Pollution haze/fog" , "Smoky haze" , "Dirty mixture of smoke and fog" , "Thick polluted mist" .)