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        Environmental Software

Lakes Environmental Newsletter

Monthly Newsletter - May 2015


Lakes Environmental e-Newsletter

Emissions Inventory - Atmospheric Science - IT Solutions


In this issue:

  • News & Events
  • Upcoming Courses
  • Modeling Tip: New Percentile Utility in CALPUFF View
  • Articles
  • Upcoming Conferences & Trade Shows

News & Events

CALPUFF View™ Version 7.5 Released!

On May 1, 2015 Lakes Environmental released CALPUFF View Version 7.5. New features included in this release are:

  • Percentile/Rolling Average: Option to generate percentile plotfiles added to CALPOST Wizard - See this month’s Modeling Tip
  • Coastline Options: Automated download of coastlines from high-resolution GSHHG data
  • Polygonal Area Source: Area Sources with unlimited number of sides/vertices
  • MMIF Import: Import from MMIF projection file for creating new projects
  • Half-Hour Time Zones: Support for the half-hour time zones for CALPUFF modeling system Version 6.42
  • HASP Key License: Support for HASP License was discontinued due to key issues

For a detailed listing of updates available in CALPUFF View Version 7.5, please check out our latest release notes.

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

If you are a user of CALPUFF View but are no longer in maintenance, please contact for pricing to get up and running on version 7.5.

AERMOD and CALPUFF Courses in Edmonton, Alberta – A Few Spots Still Available!

A few spots remain available for the AERMOD and CALPUFF training in Edmonton from June 1 to 4, 2015.

Course: AERMOD (June 1-2, 2015)
Course: CALPUFF (June 3-4, 2015)
Location: Edmonton
Registration: Register Now


Lakes Environmental at A&WMA Conference and Exhibition

Lakes Environmental will be in Raleigh, North Carolina, from June 22-25, 2015 for the 108th Annual Air & Waste Management Conference and Exhibition.

Drop by booth #506 to meet our friendly, knowledgeable staff and for your chance to win a FREE copy of our AERMOD View or AERSCREEN View air dispersion modeling software!

Visit the conference website to register for this annual event. This year's conference offers excellent opportunities for the environmental professional. You don’t want to miss it!


Lakes Environmental Teaching Professional Development Courses at 2015 A&WMA Conference and Exhibition

As in previous years, the Air & Waste Management Association will be offering a variety of high quality professional development courses prior to the annual conference in Raleigh. This year, Lakes Environmental President, Dr. Jesse Thé, will be teaching a one-day introductory course on AERMOD air dispersion modeling. Please find below a listing of these courses.

AIR-299: AERMOD Air Dispersion Modeling – Sunday, June 21

Don’t miss this opportunity to be a part of these exciting and cost effective courses!

Congratulations to our AERMOD View Winner!

The winner of our AERMOD View draw at the Canadian Environmental Conference & Tradeshow (CANECT 2015) is Ravi Sharma from ETCOS.Environmental.

Congratulations Ravi!

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Upcoming Courses





Jun 1-2, 2015
Jun 3-4, 2015


Edmonton, AB

Register Now

Oct 19-20, 2015
Oct 21-22, 2015


London, UK

Coming Soon

Nov 9-10, 2015
Nov 11-12, 2015


São Paulo, Brazil

Coming Soon

Sep 21-22, 2015


Toronto, ON

Coming Soon

Oct 15-16, 2015


Chicago, IL

Coming Soon

For more information on the above courses, including registration information, location, and course outlines, please visit our web site:

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Modeling Tip

New Percentile Utility in CALPUFF View

The CALPUFF modeling system is used extensively for air dispersion modeling studies, but there is at least one drawback to the system. CALPUFF and its associated pre- and post-processors do not feature dynamic memory allocation. This means there are finite limits to many input parameters of the modeling system. These limits can impact the modeler’s ability to easily run the models. One example can be found when using the CALPOST model for post-processing CALPUFF model results.

Percentiles & Ranked Values

CALPOST is used to extract top-ranked concentrations for comparison to ambient air quality standards. In the United States, the standards are generally based on ranked values (e.g., 1st highest, 2nd highest, etc.). Other countries, however, have percentile-based standards (e.g., 99.8th, 99th, 90th, etc.). Since CALPOST does not natively support percentiles, the modeler must first calculate an equivalent rank.

For example, say a modeler is asked to find the 98th percentile of a 24-hour average over 1 year of modeled data.

  • 1 year of modeled data = 365 days
  • 24-hour average = 1 output value per receptor per day
  • 98% of 365 = 7.3 (1.0 - 0.98 = 0.02 * 365 = 7.3)
  • Since ranked values must be an integer, 7.3 is rounded up to 8

Thus, the 98th percentile of a 24-hour average becomes the 8th high ranked value when using CALPOST. What if the modeler wants the 98th percentile for a 1-hour average?

  • 1 year of modeled data = 8,760 hours
  • 1-hour average = 1 output value per receptor per hour
  • 98% of 8,760 = 175.2 (1.0 - 0.98 = 0.02 * 8760 = 175.2)
  • Since ranked values must be an integer, 175.2 is rounded up 176

Unfortunately, the native CALPOST model cannot accept a maximum rank greater than 10 (MXRNK <=10). Modelers could recompile CALPOST to accept a higher rank, but this requires a working knowledge of FORTRAN and model compilation that many modelers do not have. To solve this problem, Lakes Environmental developed a utility for handling percentiles directly in the CALPUFF modeling system.

New Percentile Utility from Lakes Environmental

CALPUFF View Version 7.5 was released on May 1, 2015. This update includes a brand-new utility for calculating percentiles. This utility bypasses CALPOST entirely and analyzes the hourly data in the direct CALPUFF concentration and deposition flux output files (e.g., CONC.DAT, DFLX.DAT, etc.). The output is a set of contour plot files visualized in CALPUFF View.

The Percentiles utility is found in CALPUFF View’s CALPOST Wizard. Follow the steps below to use the utility.

Step 1: Open the CALPOST Wizard and navigate to the Percentiles tab.

Step 2: Enable the Percentile Options checkbox to turn on the utility.

Step 3: hoose whether you want to output the nearest ranked value to the specified percentile (Nearest Discrete Values) or if you want the model to interpolate between ranked values (Interpolate Values). For example, the 98th percentile 1-hour average described above would extract the 176th ranked value if Nearest Discrete Values is enabled. The Interpolate Values option would interpolate concentrations between the 175th and 176th ranked values.

Step 4: Click the Add button to add a new percentile to the table

Step 5: Enter the desired percentile value. Use the ALL column to specify the same percentile value for every modeled species. For species-specific percentiles, input a value in the desired species’ column. The example below would produce 99th percentile output for all species, 98th percentile output for SO2 only, and 90th percentile output for NOX only

Step 6: Choose what Output Type you want to apply the percentiles to: Concentration, Dry Deposition, Wet Deposition, and/or Total Deposition.

Step 7: Select the Averaging Period(s) of interest. If any periods are unavailable, go to the CALPOST Wizard’s Averaging Period tab to enable other desired periods.

Step 8: Once you have specified your settings, click the button to generate the percentile plot files. These files are available under the Percentile Plots folder displayed in the CALPOST tab as seen in image below. To view the text file for the percentile results, double-click on the percentile/rolling average plot file title.

Submit Your Modeling Tips Today!

We are currently accepting submissions for the Monthly Modeling Tip section that appears in our newsletters. If you have a modeling tip that may benefit our readers, please send it to us at Your name and the name of your organization will appear below the tip providing you with an opportunity for increased exposure.

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Ozone Pollution in Europe: Fewer Alert Days but Concentrations Still High

May 6, 2015 - Air pollution by ground-level ozone continued to affect many countries across Europe during summer 2014, according to a new briefing published by the European Environment Agency (EEA). Almost all reporting countries exceeded at least once the long-term objective set by EU legislation, while the stricter alert threshold was exceeded only on four occasions.

Exposure to high concentrations of ground-level ozone can cause and aggravate cardiovascular and respiratory diseases. The European Union's Air Quality Directive sets four standards to reduce air pollution by ozone and its impacts on health.

Read Full Article Here

Supreme Court Orders Government Action on UK Air Quality

April 29, 2015 - The UK’s highest court has sent a shiver through the diesel car industry by ordering the government to show it is serious about tackling the air pollution that blights London and other cities.

In a unanimous judgment, the Supreme Court said the government must speed up efforts to meet European pollution standards and submit new air quality plans to Brussels no later than December 31, regardless of the May 7 general election outcome.

Read Full Article Here

Ontario Releases 2013 Air Quality in Ontario Report

April 15, 2015 - On the one year anniversary of the last coal plant closure in Ontario, the release of the 2013 Air Quality in Ontario report confirms that the province's air quality has improved significantly over the past 10 years as levels of pollutants and greenhouse gas pollution continue to decrease.

Read Full Article Here

EPA Publishes 20th Annual U.S. Greenhouse Gas Inventory

April 14, 2015 - WASHINGTON - The U.S. Environmental Protection Agency (EPA) released its 20th Inventory of U.S. Greenhouse Gas Emissions and Sinks today, showing a two percent increase in greenhouse gas emissions in 2013 from 2012 levels, but a nine percent drop in emissions since 2005.

Total U.S. greenhouse emissions were 6,673 million metric tons of carbon dioxide equivalent in 2013. By sector, power plants were the largest source of emissions, accounting for 31 percent of total U.S. greenhouse gas pollution. The transportation sector was the second largest source, at 27 percent. Industry and manufacturing were the third largest source, at 21 percent. The increase in total national greenhouse gas emissions between 2012 and 2013 was due to increased energy consumption across all sectors in the U.S. economy and greater use of coal for electricity generation.

Read Full Article Here

Canadian Physicians Group Blames Coal Power for Edmonton's Poor Air Quality

April 14, 2015 - A group of physicians is cautioning that Edmonton's air quality is worse than that of other larger centres such as Toronto, a fact they blame in part on coal-fired electrical generating plants.

The Canadian Association of Physicians for the Environment has examined a decade's worth of air quality data, which group member Dr. Joe Vipond says show a troubling trend in Edmonton.

Although only about one-fifth the size of greater Toronto in terms of population, Edmonton has significantly higher levels of fine particulate matter in the air, the group's findings suggest.

Read Full Article Here

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Upcoming Conferences & Trade Shows




May 26-28, 2015

Carbon Expo 2015
More Info

Barcelona, Spain

Jun 1-3, 2015

23rd International Conference on Modelling, Monitoring and Management of Air Pollution
More Info

València, Spain

Jun 15-19, 2015

Asia Clean Energy Forum
More Info

Manila, Philippines

Jun 22-25, 2015

A&WMA 108th Annual Conference & Exhibition
More Info
Lakes Environmental will be at booth #506

Raleigh, NC, USA

Jun 23-24, 2015

Emissions 2015
More Info

Troy, MI, USA

Jul 15-17, 2015

5th International Conference on Environmental Pollution and Remediation (ICEPR 2015)
More Info

Barcelona, Spain

Jul 22-24, 2015

6th International Congress of Energy and Environment Engineering and Management (CIIEM15)
More Info

Paris, France

Sep 3-5, 2015

14th International Conference on Environmental Science and Technology
More Info

Rhodes, Greece

Nov 1-5, 2015

SETAC North America 36th Annual Meeting
More Info

Salt Lake City, UT, USA

Nov 17-18, 2015

International Petroleum Environmental Conference (IPEC)
More Info

Denver, CO, USA

Nov 18-19, 2015

Petroleum, Refining & Environmental Monitoring Technologies (PEFTEC) 2015
More Info

Antwerp, Belgium

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About this Newsletter

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.

Lakes Environmental Software is a leading environmental IT company that offers a complete line of air dispersion modeling, risk assessment, emissions inventory, and emergency release software as well as training and custom software services. With satisfied users located around the globe, Lakes Environmental Software will continue to revolutionize the environmental software field.

For more information please visit our web site at:  You may also contact us by phone at (519) 746-5995 or by fax at (519)746-0793.

All comments and suggestions are welcome.  You can e-mail us at:

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