Niebla is a noun. Nublado is an adjective.

Question

There is an error above.

Accepted Answer

Hola C
Can you be more specific please? I can't see any error. In Spanish the word "niebla" is a noun and the word "nublado" is an adjective. 
The sentence might change in English, for example:
It is foggy. (foggy is an adjective in English) but
Hay niebla. (niebla is a noun in Spanish (literally "fog", not foggy)
The way we express this sentence in English and Spanish are different. We, in Spanish, literally say "There is fog" (Hay = there is, niebla= fog) but you say this same thing with "It's foggy".  
Is this what is confusing you?
Saludos
Inma

Answer

Ignore this. It has been addressed.How is there an error?"Bear in mind that hay will be followed by a noun (a noun in Spanish)"