The cause appears to be in part greater turbulence in the urban atmosphere as hot air rises from the built-up surface.
部分原因似乎是热空气从楼宇密集的表面上升，造成城市大气的更大湍流。
2
As soon as you uncork a bottle, CO2 starts diffusing from the champagne into the air. But pouring it speeds up that process, by increasing surface area and turbulence.