I live in Hamburg in northern Germany and a few years ago I started to notice this: It is always foggy on new years eve. Yesterday there even was a sight distance of about 10 meters at some point. This doesn't happen usually in the city.
I have some basic meteorology knowledge and know about the process of how fog emerges. But the fact that it happens every new years eve with extreme intensity got me thinking. It can't be a coincidence.
My theory is that there are a lot of particles in the atmosphere from the fireworks and that water condenses on them. Am I right or is there another reason? Or am I completely wrong and this is just coincidence?