Why is there an increase in cloud cover over cities?

This fact can be easily explained. The fact is that the city is a territory with warmer air. And the whole point is that the city has a lot of transport and, accordingly, exhaust gases, there is also a lot of industry and the like. All this generates additional heat, and asphalt also absorbs heat and then radiates it. Thanks to this, convective currents appear on the earth’s surface, which ultimately leads to more stable cloudiness over these territories.