... CO2increases local air pollution, then cities, counties,states, and small countries can reduce air pollution healthproblems by reducing their own CO2emissions, regardlessof whether other air pollutants ... than in summer. Since boundary-layer heights were higher during the Aug-Oct simulations, CO2mixed faster up to higheraltitudes during summer. Initially, the higher CO2warmedthe air up to ... emitted CO2may reduce local air pollution mortalityeven if CO2in adjacent regions is not controlled. If correct, thisresult contradicts the basis for air pollution regulationsworldwide,...