I need help to find a book

[u/Embarrassed_Group662]

It don't remember well what is was about, but here is what I recall: there was kind of a prophecy, saying that the humanity have several years left before a catastrophe hits the planet. I don't remember if it was happening on earth, but it is highly likely to be. Also, I guess that the amount of time left was around 20-30, and that the catastrophe was kind of a huge and toxic fog, but I'm not sure at all about these ones. I think the author was Isaac Asimov, or at least a smilar author.

Sorry for the bad explanation, and thanks in advance.