Atmospheric quality standards and criteria
Atmospheric quality standards (Sections 197 and 198 and Schedule K of the
Clean Air Regulation) and criteria (Environment
Quality Act) have been devised to facilitate air quality assessment.
They can be used to assess the results of measures carried out within the
framework of various monitoring programs, establish an air quality index or
judge the outcomes of atmospheric dispersion modelling studies conducted in
conjunction with authorization requests and environmental impact studies.
They were designed to protect human health and minimize nuisances and
impacts on ecosystems.
Québec air quality standards and criteria
(French, Excel, 368 KB)
- Air quality standards for nickel – Draft regulation amending the Clean Air Regulation
- Ambient air quality -
Frequently asked questions (French)
d’application et de détermination des critères de qualité de
explains the procedure used for determining and applying
standards and criteria, and provides definitions and
Méthode de détermination des critères de qualité de
l’air (method for determining air
quality criteria - In review process):
explains the method used to determine criteria.
Guide de la modélisation de la dispersion atmosphérique
(atmospheric dispersion modelling guide - French, PDF,
144 KB) and
Guide d’estimation de la concentration de dioxyde d’azote
dans l’air ambiant (guide for estimating the
concentration of ambient nitrogen dioxide - French, PDF,
present the methodology and models advocated by the
for conducting atmospheric dispersion studies. Atmospheric
dispersion models are used to calculate the concentrations
expected in the ambient air around an emission source by
considering the characteristics of the source, region where
the source is located and weather conditions observed in the
Instruction manual for preparing and modeling atmospheric emission dispersion for mining projects
This publication sets out the main Québec legal “air” environment for mining projects and provides examples of pertinent information that needs to be provided during the various phases of a mining project. It also stipulates what information is accepted by the Ministère for emission level modeling and gives details on atmospheric dispersion modeling.
form that the modeller must complete and submit
to the Ministère for approval prior to conducting atmospheric
- Meteorological data set
(ZIP, 17 MB)
Septembre 2019 update
The data can be directly used for AMS/EPA
Regulatory Model simulations without additional manipulation
when deemed representative of the modelling site. Please
note that the available data sets have been updated to take
account of the latest EPA recommendations.
Data is available for the following
weather stations: Québec, Montréal, Mirabel, Lemieux, Bécancour, Granby, St-Germain-de-Grantham, Beauceville, L’Assomption, Trois-Rivières, Mont-Joli, Bagotville
For other questions or information requests, use the
Information Request form.