Meaning of the word "heavy fog" in English

What does "heavy fog" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

heavy fog

US /ˈhɛvi fɔɡ/
UK /ˈhɛvi fɒɡ/

Noun

a very thick fog that makes it difficult to see

Example:
Driving was dangerous due to the heavy fog.
The airport was closed because of heavy fog.