Lakes Environmental Newsletter
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Monthly Newsletter - December 2019 Edition

Happy Holidays from Lakes Environmental!

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Our entire staff would like to thank you, our clients and subscribers, for a successful 2019. Best wishes to you for a wonderful holiday season and prosperous New Year. Itís because of you that we love doing what we do! We look forward to working with you in 2020!

Please find below our office holiday schedule:

December 23


December 24-26


December 27


December 30


December 31


January 1


January 2-3


If you have an urgent matter requiring assistance during the holidays, please e-mail us at and we will respond to your inquiry during regular business hours.

AERMOD View Version 9.8.3 Released

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Last month, we released AERMOD View Version 9.8.3. This release includes the following updates:

  • Digital Signature: Installation is digitally signed for additional security
  • AERSURFACE Utility: Several enhancements to make the utility more efficient to use
  • Multi-Chemical: Optimized for polyline source objects (Line Area, Line Volume)
  • Source Groups: Support for RLINE sources and additional optimization
  • Additional Notes: Review the full release notes for a detailed list of all changes

If you are currently in maintenance for AERMOD View and did not receive an email regarding this update, please contact us at

If you are a user of AERMOD View but are no longer in maintenance, please contact our Sales Team at for pricing to update your software and be eligible for this new release.

IRAP-h View Version 5.1 Released

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Last month, we also released IRAP-h View Version 5.1. If your software license is in maintenance, please be sure to visit our Software Update site to download and install this new version. You can view our latest IRAP-h View release notes for further information on this update.

Please contact our Sales Team should you be interested in upgrading your maintenance so you can access this new release.

AERMOD and CALPUFF Courses in Dallas, Texas Ė Feb 24-27, 2020

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We will host 4 days of AERMOD and CALPUFF training in Dallas from February 24-27, 2020.

Both courses will include a WRF case study for each studentís desired location and the CALPUFF portion of this course will also include a special Class I Area Visibility case study.


AERMOD (Feb 24-25, 2020)



CALPUFF (Feb 26-27, 2020)


10% Discount Ends:

January 25, 2020



Dallas, Texas



AERMOD Course in Toronto, Canada Ė Mar 5-6, 2020

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Our team will present a 2-day AERMOD course in Toronto from March 5-6, 2020.

This course will feature important details about changes to the approved versions of AERMOD & AERMET under Ontario Regulation 419/05 scheduled for April 2020.

It will also include a special case study regarding the dispersion modeling requirements of Ontario Regulation 419/05: Air Pollution - Local Air Quality as well as a do-it-yourself WRF case study for each studentís desired location.


AERMOD (Mar 5-6, 2020)


10% Discount Ends:

February 4, 2020



Toronto, Ontario



AERMOD and CALPUFF Courses in Las Vegas, Nevada Ė April 20-23, 2020

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Our senior subject matter experts will be in Las Vegas to present 4 days of AERMOD and CALPUFF training from April 20-23, 2020.

Both courses will include a WRF case study for each studentís desired location and the CALPUFF portion of this course will also include a special Class I Area Visibility case study.


AERMOD (Apr 20-21, 2020)



CALPUFF (Apr 22-23, 2020)


10% Discount Ends:

March 6, 2020



Las Vegas, Nevada



New Solution from Lakes Software

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2020 Course Schedule

February 24-27, 2020 | Dallas, TX
Register →

March 5-6, 2020 | Toronto, ON
Register →

April 20-23, 2020 | Las Vegas, NV
Register →

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Modeling Urban Sources in AERMOD

Modeling Urban Sources in AERMOD requires consideration of the influence caused by the urban heat island effect, which causes the hours just after sunset to behave in a more convective and turbulent manner. AERMOD has capabilities to model this boundary layer by enabling the urban dispersion coefficient.

AERMOD uses population data to estimate the magnitude of the urban-rural temperature difference / urban heat island effect. In addition, the model allows users to define which sources are located in an urban region.

Guidance on defining an area as urban as well as calculating the population for input to the model can be found on the U.S. EPAís website:

Follow the steps below to define urban areas in AERMOD View.

Step 1: On the Control Pathway, go to the Pollutant/Averaging options. Under Dispersion Coefficient, select Urban.

Modeling Tip picture

Step 2: Head to the Source Pathway and select the Urban Groups settings.

Step 3: Define the type of groups that will be defined. To specify all sources as urban, use the Single Urban Group (ALL Sources) option. If you want to specify some sources as urban and some as rural, select the User-Defined Urban Groups.

If using the User-Defined option, the group definition is similar to defining Source Groups. First, add a new group by selecting the Modeling Tip picture  button. Then, select the source or sources and add them to the group using the Modeling Tip picture  button.

Modeling Tip picture
Defining Custom Urban Groups

Step 4: For every Urban Group, you must set a Population value. Section 5.2 of the AERMOD Implementation Guide defines the process for setting this value.

Step 5: Each group can also have an optional Roughness Length defined. Per the AERMOD Implementation Guide, modifying the default value of 1.0 meter requires justification as an alternative model.

Once the groups and populations are defined, you can run the model.



Saving the Ozone Layer in 1987 Slowed Global Warming

December 9, 2019- The Montreal Protocol, an international agreement signed in 1987 to stop chlorofluorocarbons (CFCs) destroying the ozone layer, now appears to be the first international treaty to successfully slow the rate of global warming.

Read more →

What's Wrong With Geoengineering Climate Change?

November 29, 2019 - Researchers have been coming up with some pretty interesting ideas on how to slow down climate change. From sucking carbon dioxide and other greenhouse gases out of the air, to shooting particles in the stratosphere to reduce the amount of the sunís heat from reaching Earth.

Read more →

Additional Environmental News

Visit the Environmental News Network (ENN), the most dependable online environmental news source!



2020 Conference Schedule

Air & Waste Management Associationís 113th Annual Conference & Exhibition
(Booth # 304)

June 29 - July 2, 2020 | San Francisco, California

Learn more →


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This newsletter contains information gleaned from various sources on the web, with complete links
to the sources cited. Organizations cited are in no way affiliated with Lakes Environmental Software.

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