Every time it rains heavily, the toilet purrs and stinks, and the smelly water rebounds.

Because of the rainy weather, the smell flows to a low pressure.

The reason is that it is rainy, the weather is humid, the atmosphere is low, the underground air pressure is high, and the smell flows from high pressure to low pressure. Atmospheric pressure is related to temperature. The higher the temperature, the greater the pressure.

Driven by the air pressure, the smell of the sewer is more likely to flow back into the room from the sewer pipe. Although there is a certain height of water to seal the water, when the air pressure is too small, the smell will break through the barrier of the water seal, resulting in unpleasant smell in the bathroom, slow air diffusion on the ground, and more difficult for the toilet smell to spread out. Therefore, when it is cloudy, rainy or wet, the bathroom smells particularly strong.