"Eu não dirijo quando há neblina."

Translation: I do not drive when there is fog.

[oliveiracilhas]

Também é correto: Eu não conduzo quando há nevoeiro/neblina.

[DominoD87]

mist should be accepted, no?

[WesleyAlcoforado]

I don't think it's the case, since the only difference between mist and fog is that it's called fog when you have a short range visibility. So if you cannot drive because there is "neblina", it's definitely a fog.

Just my 2 cents.

[delvi]

I used the word "mist" and it was accepted. Dec.22.14

[ramzesdidi]

I believe ''..when it's misty'' is a correct answer too

[TygerK]

Yeah, kind of...the meanings are definitely close enough. Just that, 'neblina' is definitely a noun, whereas, 'misty' is more of an adjective.

Depends on how strict/literal they want to be.

[Danmoller]

Considering Portuguese would hardly use an adjective form for this sentence, "when it's misty/foggy" seems to suit this one very well too.

[mcxW91]

And we would usually use the adjective in English

[WaynK8]

As both "há" and "tem" can mean "there is", are they interchangeable or are there rules for using one versus the other?

[Paulenrique]

"Tem" is informal and used in spoken language.