Use a Lasercutter with no ventilation but a good mask?

I bought a Falcon 2 and now I want to start using it. I have a dedicated room for myself in the basement. I was thinking about using the cutter without ventilation but wearing an A2P3 mask the whole time, and keeping it on until I leave the room. Is this a bad idea?

There is a window in the room, but I’m honestly a bit concerned about simply letting all the fumes go outside where my neighbors and nearby gardens would be exposed to them.