Where there is fog, the atmosphere is still. So if an area suffers from acid fog it is usually the result of local pollutants, and no blame can be attached to neighboring countries.
有霧，表示空氣不流動，因此當一地的霧也發酸，大多是地方自己的汙染物質排不出去而形成，怪不到鄰國，可說是「自作自受」。