Lakes Environmental Newsletter
News header


Monthly Newsletter - January 2020 Edition

CALPUFF Model Version 7.3.1 Update

toronto Header

On October 1, 2019, new executables for CALPUFF's Version 7 modeling system were published to the CALPUFF Modeling System website. The updates incorporate a new agricultural spraying source type in CALPUFF as well as fixes for several bugs. The updated executable versions are as follows:

  • CALPUFF version 7.3.1
  • CALPOST version 7.3.0
  • CALSUM version 7.2.0
  • POSTUTIL version 7.2.0

While preparing these new executables for incorporation into CALPUFF View, Lakes Environmental developers found compilation issues which prevent the updated executables from practical use due to very restrictive limits placed on several model objects. These issues have been reported to the model developer for correction.

While the CALPUFF developers correct the issues identified, Lakes Environmental plans to release an update to CALPUFF View later this month.

While we wait on updates to the Version 7 models and processors, current CALPUFF View users can still download the previously released executables. To facilitate this, we have updated the CALPUFF Model Download Instructions. Users in current maintenance can access the updated instructions from our CALPUFF View Software Updates webpage.

If your copy of CALPUFF View is no longer in maintenance, please contact our sales team at for pricing to update your software.

AERMOD Course in Dallas, Texas – Feb 24-25, 2020

training header

We will host 2 days of AERMOD training in Dallas from February 24-25, 2020. This course will include a special WRF case study for each student’s preferred location.


AERMOD (Feb 24-25, 2020)


10% Discount Ends:

February 1, 2020



Dallas, Texas



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

training header

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 implementation in April 2020.

Training 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 student’s desired location.


AERMOD (Mar 5-6, 2020)


10% Discount Ends:

February 4, 2020



Toronto, Ontario



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

training header

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 student’s 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

Are you exposing your client's confidential information? Sending your secrets by post cards is safer than sending by e-mail!

Don't be charged with negligence. Try Zebu today!

Zebu Feature Ad

Install Free Now


2020 Course Schedule

February 24-25, 2020 | Dallas, TX
Register →

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

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

aqmis ad


Modeling Sub-Hourly Time Steps in CALPUFF

In past modeling tips, we have discussed how to estimate sub-hourly pollutant concentrations using AERMOD, a Gaussian plume dispersion model with an hourly minimum time step. Now we look at how a similar concept can be modeled using a different modeling system – CALPUFF.

Modeling short-duration impacts is an important process in air dispersion modeling. Odors, for example, can occur over a short period of time where a one-hour (or longer) averaging period is not appropriate for detection. The CALPUFF Version 6 & Version 7 modeling systems support sub-hourly time steps allowing you to perform short-term modeling without using conversions during post-processing.

To run a sub-hourly modeling project using CALPUFF View, set the Time Step field in the CALMET and CALPUFF Run Information dialogs to the number of seconds desired. The example below uses a 600 second (10 minute) time step.

Modeling Tip picture

Input data to CALMET can be given in the assigned time step. If prognostic data are used as input, CALMET will interpolate the meteorological parameters to generate results in the user-defined time step.

After a successful model run, CALPUFF View’s Plume Animation will display the contours for each sub-hourly time step.

Modeling Tip picture
Sample project displaying instantaneous 10-minute average concentrations

Sub-hourly averages can be calculated in CALPOST by selecting the Time-Step (1-Period) option within the Averaging Period tab of CALPUFF View’s CALPOST Options dialog.

Modeling Tip picture



Climate Change: Three Ways to Market the Science to Reach the Sceptics

January 3, 2020- One in five Americans think that climate change is a myth, or that humans aren’t responsible for it. What’s more, they’re backed up by many in the Middle East and parts of Asia, especially China. They’re a vocal minority too – and with the ear of the US president, they are therefore a serious obstacle to collective climate action.

Read more →

Will Retiring Coal-Fired Power Plants Lead To More Volatile Electricity Prices?

January 3, 2020 - The latest issue of The Takeaway explores the financial implications of coal-to-gas fuel switching in U.S. power plants.

Read more →

Additional Environmental News

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



2020 Conference Schedule

Air & Waste Management Association’s 113th Annual Conference & Exhibition
(Booth # 304)

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

Learn more →


Lakes Footer
ENN Footer
ZEBU Footer

Lakes Logo
twitter   facebook   linkedin

1-170 Columbia St. W.
Waterloo, ON N2L 3L3

View Online

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.

For more information, please visit our web site at:
All comments and suggestions are welcome.  You can e-mail us at:
Privacy Policy