Do you get the Clean Air Credit if you leased an electric vehicle?

no.

To qualify for the credit when you buy a new vehicle you must:

• Buy the vehicle for your own use, not for resale
• Use it primarily in the U.S.

For credit when buying a previously owned:

• Be an individual who bought the vehicle for use and not for resale
• Not be the original owner
• Not be claimed as a dependent on another person's tax return
• Not have claimed another used clean vehicle credit in the 3 years before the purchase date

For more details check: How to claim a clean vehicle tax credit