Lakes Environmental Newsletter
Lakes Software Monthly Newsletter


Monthly Newsletter - November 2021

Lakes Environmental President, Dr. Jesse Van Griensven Thé Presents at COP26

Dr. Jesse Van Griensven Thé, President of Lakes Environmental was honoured to be invited by the Ministerio do Meio Ambiente (MMA), an internationally respected Brazilian federal environment agency, to speak on Brazil’s behalf at the United Nations’ COP26 just held in Glasgow.

Dr. Jesse provided engineering expertise and advice to MMA to assist them with their efforts to decarbonize the economy. The project’s focus is to use the abundant wind and solar energy in Northern Brazil to generate green hydrogen.

You can view his presentation by clicking on the button below.

Watch Video

Lakes Environmental December Holiday Schedule

Please find below the holiday schedule for Lakes Environmental’s offices:

December 24


December 27


December 31


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.

Online CALPUFF Course – Jan 25-26, 2022

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Our top subject matter experts will present 2 days of online CALPUFF training from January 25 to 26, 2022 (8:30am to 5:00pm UTC-6). The same great course, now from the convenience of your home or office!

Register now before space is gone!

Note: Due to the immense popularity of our online courses and small class sizes, we recommend registering and making payment as soon as possible.


CALPUFF (Jan 25-26, 2022)



Online AERMOD Course – Feb 8-9, 2022

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Spots are already filling fast for our online AERMOD course taking place on February 8 and 9, 2022 from 8:30am to 5:00pm (Central Time UTC-6).

Don't miss out! Register today!


AERMOD (Feb 8-9, 2022)




2022 Course Schedule

Jan 25-26, 2022
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Feb 8-9, 2022
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Mar 8-9, 2022
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Apr 12-13, 2022
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May 17-18, 2022
Register →

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Defining Receptors in CALPOST

The CALPUFF model allows users to specify receptors in two different formats:

  1. Gridded Receptors are defined as the Sampling Grid in which receptor locations are defined by the Meteorological Grid dimensions and extents.
  2. Discrete Receptors are located based on user-defined coordinates for each individual receptor.

When post-processing results from the CALPUFF model using the CALPOST post-processor, users can choose only a subset of the receptors modeled by CALPUFF. This gives modelers flexibility by allowing them to post-process results for specific locations without running the entire dispersion model again.

CALPUFF View contains special tools to allow users to easily define which receptors to process in CALPOST. By default, the checkboxes next to the Gridded and Discrete fields are checked meaning all modeled receptors will be processed.

Modeling Tip picture
CALPUFF View’s CALPOST Wizard Receptors Selection

To process fewer receptors, modelers should choose the Select Gridded Subset or Select Discrete Subset buttons to define the receptors to process.

Gridded Receptors

Modeling Tip picture
Gridded Receptor Selector Utility

When you first open the Gridded Receptor Selector dialog, all receptors are displayed as active.

Step 1: Define the largest sub-range of receptors you wish to process. No receptor outside this range will be processed. There are two ways to do this:

  • Numerically: Check the Set Main Sub-range of Gridded Receptors box. Type in the values for the X and Y receptors with which to Begin and End the range. Click the Set to Max button to include all sampling grid receptors in the main sub-range.

    Modeling Tip picture

  • Graphically: Select the Modeling Tip picture tool. Click inside the model domain, then drag the mouse holding down the left button to specify a rectangular sub-range.

After you define the main sub-range, any receptors that were previously defined that fall outside this range will be ignored, as if they do not exist. You can re-define the main sub-range at any time to include more or fewer receptors.

Step 2: Once the main sub-range has been defined, you can use the following tools to select receptors and activate/deactivate them to create a custom receptor set:

Modeling Tip picture

Discrete Receptors

Modeling Tip picture
Discrete Receptor Selector Utility

Select the Process Only Specified Receptors radio button to choose which discrete receptors will be processed by CALPOST. Receptors are presented in a list based on the order they are listed in the Discrete Receptors dialog back in the main interface. Use the available controls to select or deactivate each receptor.



Emission Reductions From Pandemic Had Unexpected Effects on Atmosphere

November 10, 2021 - Worldwide restrictions during the COVID-19 pandemic caused huge reductions in travel and other economic activities, resulting in lower emissions.

Read more →

Methane’s Short Lifespan Presents Golden Opportunity to Quickly Address Climate Change

November 10, 2021- A Q&A with a Berkeley Lab scientist on how a comprehensive low-cost, high-tech approach to pinpointing California super emitters could bring about rapid methane emissions reduction within a decade.

Read more →

Additional Environmental News

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



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