Answer:

SMOG

Answer	Crossword Clue
SMOG	London woe
SMOG	Los Angeles weather woe
SMOG	Urban bane

SMOG	Cause of a bad air day?
SMOG	Pollution problem
SMOG	Urban blight
SMOG	Urban health concern
SMOG	Beijing environmental issue
SMOG	Megalopolis challenge
SMOG	Air pollution
SMOG	Urban miasma

SMOG	Air apparent?
SMOG	Feature of a bad air day
SMOG	Air blight
SMOG	Kind of haze
SMOG	EPA concern
SMOG	Maker of a bad air day
SMOG	Big city problem
SMOG	Hazardous haze

SMOG	Bane of visibility
SMOG	Urban pall
SMOG	Big-city problem
SMOG	London's Great ... of 1952
SMOG	Pollution-oriented portmanteau word
SMOG	Skyline obscurer
SMOG	Air condition?
SMOG	Industrial-zone feature

SMOG	Clean Air Act concern
SMOG	Environmentalist's concern
SMOG	Urban hazard
SMOG	Atmospheric pollution
SMOG	Dirty haze
SMOG	Tinseltown problem
SMOG	Urban air problem
SMOG	Air quality concern

SMOG	Urban pollutant
SMOG	Urban alert subject
SMOG	Urban haze
SMOG	City scenery blurrer
SMOG	Troubling haze