There’s an ongoing household debate that seems simple but actually has a surprisingly interesting answer: should the toilet lid be up or down when you flush? Some people close it every single time, while others barely think about it. The issue goes beyond appearance, because flushing can release tiny droplets and particles into the surrounding air. This phenomenon is often referred to as a “toilet plume.”

When a toilet is flushed, the movement of water can create an aerosol of very small droplets that may travel beyond the bowl. Depending on the toilet and flushing conditions, these particles can potentially settle on nearby surfaces, including bathroom fixtures and personal items. That’s why keeping toothbrushes, towels, and other frequently used items away from the toilet is a sensible hygiene habit.

But does simply closing the lid solve the problem? Not completely. Research suggests that lowering the lid may change how particles move, but it does not necessarily prevent all aerosols from escaping. Some studies have found that particles can still become airborne with the lid closed, meaning that relying on the lid alone isn’t a complete solution.

So, what’s the best approach? Close the lid before flushing when possible, but also focus on good overall bathroom hygiene. Keep toothbrushes and personal items stored away from the toilet, clean frequently touched surfaces regularly, and make sure the bathroom has adequate ventilation. Closing the lid is a simple habit worth adopting, but cleanliness and proper ventilation matter just as much.