Hmmm....yes and no.
There are different models of electric cars, and many different models which cover different types of alternate fuel.
All of them create a byproduct or discharge, whether or not that is "pollution" is up for debate. Most importantly, even if a new machine does produce the same Carbon Monoxide emmissions as traditional "pollution", its the amount it makes that we should look at.
Most electric cars available to the public today are hybrids, and do still burn some gas, and therefore make some pollution. A 100% solar powered car uses its solar energy to create motion through an engine. A purely electric engine would not give off a polutant by-product, however, if you consider that the electrical plant at the other end of the recharging wire does produce polutants, we've come to a bad circle.
Hydrogen powered engines produce clean water as a by-product, which, in turn can be put through electrolosis to produce more hydrogen to power the cars. And how much pollution does electrolosis make? Well, it depends on where the power for that machine comes from.