How can a heavy-duty diesel vehicle qualify for bi-annual testing?
A heavy-duty diesel vehicle may qualify to skip a year of emissions testing if it had an opacity result of 20 per cent or less in the most recent Drive Clean test. Even model year vehicles may qualify to skip a test for renewal in even calendar years and odd model year vehicles may qualify to skip a test for renewal in odd calendar years. That Drive Clean pass must be issued within 24 months before the permit expires or, if the application for renewal is made after the expiry of the permit, within 24 months before the application for renewal.
