In Indiana they only require emission testing every two years in Lake and Porter counties, up in the northwest corner of the state, right next to Chicago. And it applies only to cars manufactured after 1976, as your do. Read below. Rest of the state is exempt.
INDIANA'S VEHICLE EMISSIONS TESTING PROGRAM
Vehicles registered in Lake and Porter counties are required to undergo emissions tests and tampering inspections every two years if they were manufactured after 1976 and have a gross vehicle weight rating (GVWR) of 9,000 pounds or less. Vehicle manufacturers typically print the GVWR on the driver-side door jamb.
Find a Clean Air Car Check emissions testing station near you
Vehicles manufactured in odd-numbered years are tested during odd-numbered years and vehicles manufactured in even-numbered years tested during even-numbered years. Exemptions include vehicles manufactured during the four latest model years and antique vehicles (as defined by 326 IAC 13-1.1-1 - see Section 1 on page 2). For instance, a vehicle with a manufacturer's model year of 2009 should be tested in 2013, and tested again in 2015 and 2017.