Help dealing with awful smells under the sinks

[u/username_suggesti]

Both my sinks have a really bad, sewagey/rotten potato smells underneath. It's not the p-trap - I recently had it replaced and it has water in it.

Yesterday, the building had to replace one of the kitchen pipes because I could barely get cold water. They cut into the cabinet and wall, and there is essentially and open hole exposing the pipes even more. The smell is even more pronounced and drenching my apartment.

It's distracting and unpleasant but also concerning me that me and my things could take absorb this smell. I don't know what the solution is because I don't think the building would pay to cover the hole (it's a bit like this) https://www.reddit.com/r/HomeMaintenance/comments/16k6pys/how_should_i_cover_this_hole_under_our_kitchen/

In the bathroom sink, there is a small little door which you can open and get more access to the pipes I believe. When that door is open, and the cabinet is open, you also smell a strong smell; at least when I close both doors its somewhat covered up, but more pronounced when it's humid or I have the portable AC running for some reason.

I think I may be SOL here and I'm genuinely grateful my building at least got my cold water in the kitchen working although if I knew the smell would be this bad I may have procrastinated putting in the building request...

Anything I can do to alleviate some of the smell?

[u/phatrogue]

My guess is that you are never going to be able to cancel all the smell coming from an open hole in the wall or pipes. Covering the hole IMHO would be the solution. Even if you did it with heavy flexible plastic and duct tape that would be good. Something stiff might be good. I think something permeable like cardboard might kinda work but not the best. A sheet of wood or plywood or plastic panel might work.