The Ministry of the Environment and Climate Change (MOECC)
has adopted by reference into law the use of two updated air
dispersion models under section 6 of its Local Air Quality
Regulation (O. Reg. 419/05). These models are used to determine
whether a facility meets the MOECC's local air quality
standards and guidelines. An information notice (EBR Registry
#012-5177) announcing the change was posted to the Environmental
Registry on November 2, 2015. Adoption of the updated models took
effect on that date.
The MOECC has replaced the previously approved versions with the
following updated models:
The US Environmental Protection
Agency's AERMOD dispersion model version 07026 is replaced with
version 14134, dated May 14, 2014.
The AERMOD model is to be used
in conjunction with the AERMET meteorological pre-processor version
14134, dated May 14, 2014, which replaces the earlier version
The ASHRAE method of
calculating same structure contamination, described in Chapter 45,
"Building Air Intake and Exhaust Design," of the 2011
ASHRAE Handbook – HVAC Applications, replaces the
method set out in the 2007 edition.
The mathematical models are used to assess the concentration of
air contaminants at the "point of impingement" where they
contact the ground or a neighbouring building. The calculated
results are then compared to the MOECC's general air standards,
site-specific standards, technical standards or guidelines, as
The approved dispersion models, as well as the Ontario Regional
Meteorological data sets (that have been reprocessed with the
updated AERMET 14134 version), are all available through the
MOECC's Rules on Air Quality website at www.ontario.ca/page/rules-air-quality-and-pollution.
Additional information is available from MOECC's Air Quality
Monitoring and Transboundary Air Sciences Section by e-mail at MetDataENE@ontario.ca or by
telephone at 416-235-6171.
As dispersion models continue to evolve, stakeholders will
receive advance notification six months in advance of the formal
adoption of any future updated versions. They will also be
notified, on an annual basis, if there will be no updates that
year. MOECC says this will give facilities time to contact their
local District Office for any assistance that may be needed
"in developing a path forward." Notice will also be
posted on the Environmental Registry six months following
pre-notification to formally adopt the updated model versions.
The content of this article is intended to provide a general
guide to the subject matter. Specialist advice should be sought
about your specific circumstances.
To print this article, all you need is to be registered on Mondaq.com.
Click to Login as an existing user or Register so you can print this article.
Ontario's Ministry of the Environment and Climate Change continues to roll out its Climate Change Action Plan with its proposed GHG guide for projects that are subject to the province's Environmental Assessment Act.
The Imperial Oil refinery pled guilty to one offence for discharging a contaminant, coker stabilizer, thermocracked gas, into the natural environment causing an adverse effect and was fined $650,000...
Register for Access and our Free Biweekly Alert for
This service is completely free. Access 250,000 archived articles from 100+ countries and get a personalised email twice a week covering developments (and yes, our lawyers like to think you’ve read our Disclaimer).