Cars from canda will pass emissions test from US, the only thing that can happen is that you will need to pass a test to make sure the car is fine, catalytic system, lights, etc...
Just to make sure it is in good shape.
My car is from Ontario, the province next to quebec in canada.
I had to pass that test, here thats the SAAQ test, based on like 150 item, from emergency light to catalytic converter..etc...... i got a sticker now on my windshield
i am legal in quebec.