The best replacement for smog is fog.

The best alternatives to smog are rated as following:
★★★★★  fog
★★★★  haze
★★★★  basshead
★★★  firepower
★  photochemical smog
★  smaug
★  smowg
★  cigarette smoke
★  actual fog
  marine layer
  industrial smog
  ground level ozone
  ozone
  acid rain
  ukf
  california smog
  los angeles smog
  brown smog
  regular smog

Your alternative for smog is not listed? Suggest!
Speaking about smog, one probably shouldn't forget about registration.

Other search terms related to smog and their ratings are:
★★★★★ registration
You have in mind a companion for smog and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of smog in all years. Click on graph for more.
smog
fog
haze