system
Given the following post, respond as if you're commenting on Reddit:
human
How does rain effect cigarette smoke/the diffusion of odours?

I have just moved in opposite a flat full of very ignorant students. They smoke out of their kitchen window from about mid-day till 3-4am, which means if I have my windows open at any time that they are awake the smell of the smoke travels across the street (which is very narrow) and into my flat. Today has been very rainy and I have left my window open in my bedroom for several hours and have noticed that I haven't smelt any of their smoke, even though they have been smoking as usual. I wondered whether the rain has an effect on the diffusion of the smoke particles as they travel across the street and if so how? Or is something else sciency happening? I'm just really curious to know why.
gpt
The rain actually has a cleaning effect on the air. When rain falls, it attracts many aerosol particles including the particles made by cigarettes which cause their smell. Then the particles get brought to the ground and are released into the ground, never to reach your nose.