Late 2022 Updates to ECAs, EASRs and NPRI


Airzone has been involved in air dispersion modeling and permitting for over 20 years with a broad range of clients. We can help prepare your ESDM for EASR or ECA application submissions for your facility to the Ministry of Environment, Conservation and Parks (MECP).

Recent developments in regulatory requirements are listed below. In April 2020, the MECP replaced regulatory models AERMET/AERMOD with newer versions. They now require that almost all of the ESDM modelling be carried out with the new versions listed below:

  • AERMOD dispersion model version 19191 (version date July 10, 2019)
  • AERMET meteorological preprocessor version 19191 (version date July 10, 2019), and
  • ASHRAE method of calculation following Chapter 46 (Building Air Intake and Exhaust Design) of the 2019 ASHRAE Handbook – HVAC Applications

Toxics Reduction Program

The MECP has made changes to the Toxics Reduction Program to eliminate duplication with the Federal Government’s Chemicals Management Plan under the Canadian Environmental Protection Act, 1999 and reduce burden for industry.

On December 31, 2021, the Toxics Reduction Act, 2009 was repealed and the associated regulations revoked, ending the Toxics Reduction Program. Reporting is now done on a voluntary basis.

Updates on NPRI Reporting

The reporting deadline for the calendar year 2022 is June 1st, 2023. The following changes took effect as of the 2022 reporting requirements:

  • Require reporting facilities to provide a reason when reporting a substance for the first time.
  • Require reporting facilities to indicate any applicable provincial permit numbers and provincial facility identification numbers.
  • Add “remote quantification” to the list of estimation methods that facilities can use for the purposes of reporting to the NPRI.
  • Change the description, in the list of activities that are excluded from reporting, from “research or testing” to “research or development”.
  • Change the name of three categories of releases to air.
  • Change the duration of the NPRI Canada Gazette Notice from two years to three years starting with the 2022 to 2024 NPRI Notice.

Substances added to reporting this year:
Should be reported if the facility releases, disposes, or transfers:

  • Chlorhexidine and its salts (CAS # 55-56-1).

Substances removed from reporting this year:

  • Methyl iodide (CAS# 74-88-4).
  • Hexachlorocyclopentadiene (CAS# 77-47-4).


For air permitting or emissions reporting questions, please contact:

Farida Dehghan Ph.D., P.Eng.

Air Quality Consultant

fdehghan[at] 905-890-6957 ext. 110