These questions always make me think this is somebody's science homework. Acid rain and soil pollution are two examples, though the size of the area that can be affected is highly variable. read more
While the problems of stratospheric ozone depletion and climate change are global in scale, acid deposition, another air-related environmental problem, is regional. Regional - Acid Rain The composition of rain and snow depends upon the gases or other agents present in region of the atmosphere in which the clouds are formed. read more