Air Dispersion Modeling

Air Dispersion Modeling is at the heart of what we do here at our Singapore offices in BroadTech Engineering.
We have the capability to perform some of the most complex and precise Air Dispersion Modeling (ADM) simulation using state-of-art emission estimation techniques and computer modeling software.
Based on your client specific modeling requirement and site conditions, our team of professional and experienced CFD simulation consultants will be able to provide you an accurate simulation of air pollutant dispersion using one of the USEPA recommended air dispersion modeling systems.
*The air dispersion modeling systems that we use are models that are officially recommended and preferred by USEPA

Uses of Air Dispersion Modeling (ADM)

Air dispersion modeling is carried out for a number of purposes, such as

1. Environmental Impact Assessment (EIA)
2. Pollution Control Study
3. Large-scale urban planning of built environment base on data from Airflow modeling (IL Airflow modeling)

Dispersion modeling is most often used as part of the air permitting process when a company plans to construct or modify an industrial facility. It is also useful for emergency planning and capital planning

What is Air Dispersion Modeling?

Air dispersion modeling is a key concept in environmental regulations. It is the process of estimating air pollutant concentration that results from an air emission source.
This takes into account analysis inputs and factors such as Source parameters, Meteorological conditions, and Topography of the area under study
Initially performed with manual numerical calculations in the early days, modern air dispersion modeling today is facilitated with powerful engineering simulation software tools that can perform thousand of calculation in minutes.


About Us

BroadTech Engineering is a Leading Engineering Simulation and Numerical Modelling Consultancy in Singapore.
We Help Our Clients Gain Valuable Insights to Optimize and Improve Product Performance, Reliability, and Efficiency.


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Air Dispersion Modeling

1. Powerful ANSYS FEA Simulation Software Tools

2. FEA Consultants with Extensive Research & Professional Experience

2. FEA Consultants with Extensive Research & Professional Experience

3. FEA projects Completed in a Timely and Cost-effective Manner

3. FEA projects Completed in a Timely and Cost-effective Manner

4. Proven Track Record

4. Proven Track Record

5. Affordable

5. Affordable

6. Full Knowledge Transfer

6. Full Knowledge Transfer

Featured Air Dispersion Modeling Case Studies

Atmospheric Air Dispersion:
Atmospheric dispersion modeling with CFD around CERN
Effects of a possible accidental release of an air pollutant on CERN territory including the effects of
the CERN buildings and site topography close to the source with Computational Fluid Dynamics (CFD).
Computational Domain: 5 sq km around CERN
Stack flow rates of scalars at various locations in the domain.
Merge topology for ground terrain and CERN buildings in Fluent Meshing and created unstructured polyMesh.
Boundary Condition:
Inlet: Atmospheric Boundary Layer (ABL), 2 m/s at 10m height, 0.25 atmospheric roughness
Sides and top: ABL
Outlet: Pressure outlet
Ground and buildings: wall
Stacks: velocity inlet based on flow rate
8 wind directions are considered in this study
8 wind directions and 6 sources
30-hour runtime/wind direction to run until 5 minutes after release start
Contour plots at 5s, 30s, 1min, 2min, 5min
240 contour plots, Normalized concentration
Potential of using CFD for air pollution modeling was shown.

Air Quality Action Planning


● Industrial Pollutant Emission Inventory
● Greenhouse Gas (GHG) Emission Inventory
● Alternative Emission Scenario Modeling
● Population Exposure Evaluation & Estimation
● Urban Air Quality Decision Support Systems Modeling
● Air Quality & Traffic Emission Action Planning (AQAP)
● Urban Climatic Air Quality Forecast
● Urban Air Quality Zone Mapping
● Low Emission Zones (LEZ)
● Schools & Sensitive Receptors Exposure
● Accidents & Emergency Modeling
● PM2.5 Pollutant Control & Reduction
● Construction Works Air Quality Impact (AQI) Evaluation
● Industrial Districts Air Quality Impact (AQI) Assessment
● Land Development Air Quality Impact (AQI) Assessment

Industrial Environmental Impact Assessment (EIA) And Regulatory Compliance


● Air Quality Modeling (IL: Air Quality Modelling) & Impact Assessment for Environmental Impact Assessment (EIA)

● Air quality Simulation & Impact Assessment for Sustainability Impact Assessment (SIA)
● Evaluation of mitigation measures efficiency
● Comparison of alternative mitigation measures
● Stack height assessment
● Evaluation of plant modification plans
● Litigation support
● Environmental Regulatory Compliance studies
● Air Quality Forecasting services to avoid standard exceedances
● Accidental leakage release modeling
● Emergency plans

Call Us for a Free Consultation

Customers will be provided with fully customisable CFD reports which detail the Methodology, in-depth analysis, and recommendations.
This insight allows our customers to optimize performance and make informed engineering decisions in a scientific, proven manner.

Learn more what our Air Dispersion Modeling services can do for your company today by calling us at +6581822236 for a no obligation discussion of your needs.
If you have any questions or queries our knowledgeable and friendly consultants will be happy to assist and understand more about your project needs and requirements.
Alternatively, for quote request, simply email us your detailed technical specifications & requirements to

Air Dispersion Modeling Scenarios

The Types of air dispersion model and the air quality modeling scenarios that it can simulate includes

1. AERMOD Air Dispersion Modeling System

AERMOD is used for air dispersion modeling of most near airfield industrial scenarios.
It is a steady-state plume simulation modeling system, that incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts.
This includes treatment of both surface and elevated sources, as well as geographical terrains which are both simple and complex.
The AERMOD air dispersion modeling system consists of various input data processors, such as


AERMET is a meteorological data preprocessor that accounts for air dispersion based on turbulence at planetary boundary layer structure and scaling concepts. AERMET is a regulatory component of the AEROMOD modeling system


AERSCREEN is a screening version of AERMOD. It is used for worse case screening analysis


AERMAP is a terrain data preprocessor that incorporates complex terrain using USGS Digital Elevation Data. AERMAP is a regulatory component of the AEROMOD modeling system


BPIPPRIM a multi-building dimensions program which uses the GEP technical procedures for PRIME applications.


AERSURFACE is a surface characteristics preprocessor used for input parameter into AERMOD air dispersion modeling

2. CALPUFF Air Dispersion Modeling System

CALPUFF is for Air Dispersion situations when the source is greater than 50km from the area of concern study
It is a non-steady-state, Multi-layer, Multi-species puff dispersion model that simulates the effects of time- and space-varying climatic conditions on pollution transport, transformation, and removal.
CALPUFF is equipped with computation algorithms which can be applied to

1. Subgrid-scale effects and complex terrain with scales of up to tens to hundreds of kilometers (such as terrain impingement)
2. Long-range effects (such as Removal of emission air pollutant due to Wet scavenging and dry deposition, chemical transformation, and visibility effects of particulate matter concentrations).


3. BLP

BLP is a Gaussian plume dispersion model specifically adapted to solve unique air dispersion modeling challenges associated with to industrial emission sources, such as aluminum reduction industrial plants where the environmental effects of plume rise and downwash from stationary line sources are critical.


CALINE3 is a steady-state Gaussian dispersion modeling system specifically designed to evaluate air contaminant concentrations at receptor locations downwind of highways located in relatively simple geographical terrain.
In practice, CALINE3 is integrated into the more refined CAL3QHC and CAL3QHCR air dispersion models.


CAL3QHC is a CALINE3 based CO model with queuing and hotspot computation and with a traffic simulation model to calculate delays and queues that occur at signalized intersections.
CAL3QHCR is a more evolved version built based on CAL3QHC that requires an input of local meteorological data.


Dispersion modeling of industrial emission of dense gases that slumps and disperse

7. Puff Models

Accidental releases from tank rupture or other equipment failures

8. Regional Scale Models

Regional scale models where the model is used to study and evaluate pollutant impact for the entire metropolitan area