Refers to atmospheric obscurity caused by fine particles, smoke, or moisture. Often used in weather or environmental contexts.
Because of the haze, the distant mountains were not visible.
Smog tends to occur in urban areas.
aerosol
Compound of 煙 (smoke) and 霧 (fog/mist), literally 'smoke-fog'. The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning.