Services
Air Dispersion Modelling
Predict off-site air quality impacts, support permitting, and communicate results clearly—using defensible modelling approaches aligned with Canadian and Ontario expectations.
What we deliver
Modelling that supports confident decisions
SRJ Consulting provides air dispersion modelling to quantify ambient concentrations from project and operational emissions. We focus on transparent assumptions, regulator-ready documentation, and results you can use for design, permitting, and stakeholder communication.
Regulatory modelling & screening
Appropriate model selection, receptor grids, averaging periods, and comparison to applicable air quality criteria and guidelines.
Source characterization
Point, area, volume, and line sources with defensible parameters (stack data, release conditions, building dimensions, and operating scenarios).
Meteorology & terrain
Use of representative meteorological datasets and terrain/land-use inputs to reflect site conditions and sensitivity where needed.
Results, interpretation & reporting
Clear figures and tables, exceedance assessment, contribution analysis, and practical recommendations for mitigation and next steps.
How we work
A practical, defensible modelling workflow
Typical applications
Where air dispersion modelling adds value
New & modified sources
Permitting support
Assess impacts from stacks, vents, and fugitive sources and support approvals with regulator-ready documentation.
Facility changes
Design decisions
Compare scenarios, evaluate mitigation options, and identify the drivers of predicted concentrations.
Community questions
Clear communication
Summarize results with maps, contours, and plain-language interpretation for stakeholders.
We tailor the modelling approach to the project context—balancing conservatism, realism, and clarity so results are useful and defensible.
Air dispersion modelling FAQs
A few common questions we receive when supporting projects across Canada (with a focus in Ontario).
Which dispersion model do you use?
We select the model and options that best fit the regulatory context and source types (e.g., screening vs. refined), and we document the rationale and settings used.
What inputs do you need from us?
Typically: site location, operating scenarios, stack/source parameters, building dimensions (if applicable), and emissions estimates or monitoring data. We can help develop missing inputs where feasible.
How long does a study take?
Timelines depend on complexity and data readiness. Many projects progress in stages—initial screening, refinement, and reporting—so decisions can be made early while details are finalized.
Can you model multiple scenarios or future expansions?
Yes. We commonly evaluate baseline vs. project conditions, different operating cases, mitigation options, and phased expansions to support planning and permitting.
Do you provide regulator-ready reporting?
Yes. We prepare clear, well-structured documentation with transparent assumptions, inputs, and results to support submissions and technical review.
Can you support us after the modelling is complete?
We can help interpret feedback, respond to technical questions, and align next steps such as monitoring plans, emissions inventory refinement, or mitigation evaluation.