There's a lot of fog. Is it still safe to continue?
Nebbia: NEB-byah. Double b, stress on the first syllable.
Use when visibility drops on a mountain trail and you need a local opinion on safety. Fog can arrive quickly in the Alps and Apennines, making navigation very difficult.
C'è molta nebbia describes the current condition. Ancora means 'still' — continuare means 'to continue'. The question politely asks for guidance without panicking.
Non vedo il sentiero nella nebbia.
I can't see the trail in the fog.
Describe your specific problem clearly.
Aspettiamo che si alzi la nebbia?
Shall we wait for the fog to lift?
Si alzi is subjunctive — the fog 'rises' in Italian.
Meglio scendere ora o aspettare?
Better to go down now or wait?
Asking for a clear recommendation.
Mountain fog (nebbia or più spesso 'nuvole basse' — low clouds) is a serious hazard on unmarked sections of Italian trails. Experienced Italian hikers use a compass and 1:25,000 topographic map when visibility drops — GPS alone can fail if the battery dies.