In Washington State it varies from city to city and county. As you get closer to a city, you are required to pass emissions prior to renewing your tabs. If you live out in the country, they leave you alone.
No emission testing in MN. TX has E-testing in the metor areas, DFW, Houston, Austin, etc..,If your car is registered there. To get around that have a p.o. box outside of the county and have your car registered to it