Due to the budget crisis in Illinois, the Illinois EPA has suspended the mailing of emissions test notifications. If you have plates expiring at the end of March 2016 you’ll be the first group of drivers who do not receive a mailed notification for the emissions test.
The EPA encourages drivers to get their emissions test done several weeks before the plate sticker expiration date, particularly should you need to have repairs done if you don’t pass the initial test. You can have your emissions test done 4 months in advance of when your plates expire. If your emissions test is not completed and in the system it can cause problems when renewing your plates or drivers license.
The Illinois Secretary of State has an online tool to determine whether your vehicle is due for an emissions test: http://www.ilsos.gov/regstatus/
For further information please visit Illinois Environmental Protection Agency: Vehicle Emissions Testing Program