Just in from the MOECC...
As per the pre-notification sent out on October 2, 2017, please note that the ministry adopted the updated air dispersion model versions today!
On April 4, 2018, the Ministry of the Environment and Climate Change adopted updated versions of United States Environmental Protection Agency (USEPA) AERMOD/AERMET and American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) air dispersion models under O.Reg. 419/05.
For more information on the updated air dispersion models, please refer to the Information Notice on the Environmental Registry Number 013-2472.