Many leases or house rules have restrictions allowing odors to go into common areas or other units. If that is the case and the board has been notified and is refusing to do anything, perhaps speak to an attorney about your options.
Another option is to seal up your apartment so that the odors can't enter. This could be caulking the gap where the baseboard meets the floor, around window and door frames, heating and water pipes. You can also add foam draft stops around outlets and light switch plates. This will also reduce the likelihood of bedbugs, roaches, etc. getting into your apartment.