Electric cars are net polluters in some locations.

Article: Are electric cars damaging YOUR region? Maps reveal how EVs can be WORSE for the environment than gas-guzzling vehicles

The study, by the National Bureau of Economic Research, looked at five major pollutants: carbon (CO2), sulphur dioxide (SO2), nitrogen (NOx), particulate matter (PM 2.5), and volatile organic compounds (VOCs). 

They took into account 11 different 2014 models of EVs, as well as the 'closest substitute' gas car. 

[snip] 

With gas cars, the worst damage, which is shown on the map in red, took place in highly-populated urban areas such as New York. 

Environmental damage for EVs appears to be worse in the Midwest and Northeast, where the electricity grid tends to rely on coal power plants.

The best place for EV's appears to be Los Angeles because 1) the electrical grid is not as dependent on coal-fired power plants and 2) because LA's temperature inversions trap pollutants from gas-powered car engines.

Note: the environmental damage does not include the impact of mining the necessary minerals for the batteries, manufacture of the batteries, and recycling them.

I am not against EV's, only that "electric" does not automatically equal "green."

Currently, each EV purchase has a $7500 subsidy from the Federal government, or taxpayers on the East Coast are subsidizing polluting their own air.