As of April 1, 2017 vehicles under 4,500 kilograms (i.e. light duty and passenger vehicles) will no longer need to be emission tested when being sold or leased. Vehicles over 7 years old will still require testing. This has no effect on heavy duty/commercial units.
Here’s a helpful link that gives the history of tested units. You’re able to get a pdf of the tests as well.http://www.driveclean.ene.gov.on.ca/ONPublicWeb/pages/vir/vehSearch.jsf?LOCALE=en_CA