These past few days our apartment stinks not because we don’t clean or throw our garbage bags it is because of the drainage system. Every time we heard water coming from the top floor occupants the stinky smell follows coming from our bathroom floor, it seems the pipes are connected and because we are in the first floor we have to suffer with the smell when the water reached the drainage. It only occurs during spring and summer season.
Dunno if the drainage needs maintenance or it is probably clogged. Drains can be clogged due to accumulation of grease, dirt and or even if someone accidentally dropped any object.