Not directly related but electric power is also a pollutant for an additional reason - electrical transmission. Electric cars dont help much when the power you get is generated by dirty means (like coal plants). There was a study which showed that depending on the quality of the grid, your distance from the plant, and the type of plant an electric car could be causing more pollution due to energy losses. Its worth noting this study was US only and issue appears almost exclusively in rural areas but the issue does exist.