That's also partially due to a phenomenon known as temperature inversion, where instead of warm air continuously rising upward, a pollution-filled layer of air remains trapped near the Earth's surface by a slightly warmer layer above.
这也部分归因于一种称为逆温的现象，在这种现象中，温暖的空气并没有持续向上上升，而是充满污染的空气层仍然被上方稍微温暖的一层困在地球表面附近。