What does it mean to dream about smog?
Smog usually points to confusion or contamination, a sense that something has clouded the air around a situation.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read the fouled air as something the dreamer half knows is wrong yet cannot see clearly through. The haze can stand for a truth being obscured. What it hides is worth asking after.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung might see smog as the clouding of clear sight by something stale or poisoned in the surroundings. It can mark a need to clear the air. The murk asks what has been allowed to gather.
Jungian concept (our summary).Modern
Continuity ties smog to waking confusion, a polluted atmosphere at work or home, or a head that feels foggy. It often follows days of clutter and strain. The haze mirrors the lack of clarity.
Continuity hypothesis (our summary).Mythological
A darkened, choking sky was read in older lore as a sign of corruption or ill omen, the heavens themselves gone wrong. Such gloom marked a world out of order. It stood for clarity lost and waiting to be restored.
Rosmerta Publishing editorial synthesis (after Frazer; Brewer).