New AERMOD Wizard is here

Posted by on Thursday, May 27th, 2021 in Newsletters


What’s Happening Now


EPA News

*HOT* 2021 RSL Workshop – EPA has announced the dates for this year’s virtual Regional, State, and Local Dispersion Modelers’ Workshop. It will be held the afternoons of June 21‑23, 2021. The Workshop will be open to industry and external stakeholders on June 21. EPA will be posting more details and a draft agenda in early June on SCRAM.

New AERMOD / AERMET / AERSCREEN – EPA has released new versions of the AERMOD modeling system. It is referred to as v21112 (gotta love those version palindromes – 18081, 19191, now 21112). AERMOD, AERMET and AERSCREEN were updated with bug fixes and some enhancements. This does not include any updates to AERSURFACE or AERMINUTE. As always, when EPA releases updates to any of the AERMOD system component programs, we update BEEST Suite to include the changes. For more information on this EPA release, go to SCRAM.

EPA presented a webinar on the new AERMOD / AERMET / AERSCREEN releases on May 24. 2021. If you were not able to attend, you can view the slides for the webinar here.

Conferences and Workshops

As you might imagine, face to face meetings and conferences are going to be rare, if not non-existent, for the near future. In addition, given the somewhat fluid nature of the times we live in, we encourage you to check organizations’ websites to find out the latest on upcoming conferences and workshops (virtual or otherwise).

AWMA ACE – The 2021 Air and Waste Management Association (AWMA) Annual Conference and Exhibition (ACE) slated for June 14-17, 2021 will be a virtual event, including virtual sessions / presentations and virtual exhibits. For more information on call for abstracts, registration, sessions, etc. go to A&WMA Annual Conference 2021.

AWMA is also sponsoring webinars and you can find out more about them at

If your company, organization, agency, state, etc. has an upcoming modeling or air quality-related event (virtual or otherwise) and you’d like it publicized in Providence/Oris Notes, please send that information to us at, and we’ll be happy to include it.



BEEST Suite 12.05 is now out and includes these updates:

  • Added Pollutant UserID to allow for multiple scenarios to have the same pollutant name
  • Added the ability to select UserIDs and met data files at run time
  • Improved “Split Met Files” form
  • Emission rates for RLINE sources are written in g/s/m2 to .DTA files
  • ADJ_U* is now set by default in AerMet
  • Added the ability to partition BPIP-Prime and BPIP model runs in BPIP Tool
  • Updated user manual for Terrain Files Converter


If you missed the webinar on the new features in BEEST Suite 12.05 on March 25, 2021 you can still view it here.

We are currently working on BEEST Suite 12.06. It will include several bug fixes and the new versions of AERMOD and AERMET.

Users in maintenance can download the most recent version of BEEST from Support → Software Updates.

“Go BEEST Mode!” – NEW THIS YEAR! – Go BEEST Mode face masks! These stylish and functional masks will be the perfect complement to your Go BEEST Mode t-shirt. These are washable/reusable and are a one size fits all. So get yours today by sending your request to

And of course, we still have plenty of Go BEEST Mode t-shirts, too! You can also request one of those by emailing us at

AerScreen for Windows

*NEW* AerScreen for Windows 4.02 is now out! This update has the following enhancements:

  • Includes AERSCREEN 21112 and AERMOD 21112
  • The Adjust U* option has been enabled by default
  • The website for downloading terrain data files has been updated
  • The user manual for Terrain Files Converter has been updated


Users in maintenance can download the most recent version of AerScreen for Windows from Support → Software Updates.

Professional CalPuff

Our most recent version of Professional CalPuff (4.00) was released August 26, 2016 and is available to all registered users with current maintenance.

Users in maintenance can download the most recent version of Professional CalPuff from Support → Software Updates.


*NEW* AERMOD Wizard 1.05 is now out! This update has the following enhancements:

  • Allows you to download EPA ambient monitoring data published in November 2020
  • Allows you to download and process monitoring data for lead (Pb)
  • Can now calculate 8-hour average concentrations for ozone
  • Includes 6-day collection frequency for PM2.5


In addition, AerMet within AERMOD Wizard has also been updated:

  • Improved “AerSurface Input Files” form
  • Fixed bug in writing wind sectors to AERMET input files when the Multiple option is selected and twelve wind sectors are entered on the “MP 2” tab


Users in maintenance can download the most recent version of AERMOD Wizard from Support → Software Updates.

If you have suggestions for an enhancement to any of our modeling software products, please let us know and we’ll do our best to incorporate it into the software ASAP!

Modeling Tip of the Month

Ever since the promulgation of the 1-hour SO2 and 1-hour NO2 NAAQS standards in 2010, and the revised 24-hour PM2.5 NAAQS in 2006, we have found ourselves with much less headspace to work with in conducting NAAQS modeling demonstrations. As we all know, a permit may be granted only if the applicant can demonstrate that the proposed project does not “cause or contribute” to an exceedance of a National Ambient Air Quality Standard. Contribute means that the applicant cannot make a significant impact at a receptor location and time period where the NAAQS is predicted to be exceeded. Because of the probabilistic form of the 1‑hour SO2, 1‑hour NO2, and 24‑hour PM2.5 NAAQS, as well as the low levels of those standards, we need a tool to help us determine whether we contribute to the exceedance. That tool is the MAXDCONT output option in AERMOD. It tracks project contributions to ALL-based exceedances. While it is very useful, it can be a rather large file to review. So, to help in graphically viewing the results in your MAXDCONT file, BEEST Suite includes MaxDCont Viewer.

MaxDCont Viewer shows graphically the depiction of the contributions to ALL from your list of source groups (one of which should include your project-only sources). You can display these contributions for all ranks specified (e.g. beginning with 4th high for 1‑hour SO2) so that you can quickly determine if your project exceeds the SIL for any of the ranks where an exceedance might be predicted. You can also apply a background map in MaxDCont Viewer; toggle sources, buildings and receptors on and off; and export your MaxDCont Viewer display to Google Earth. As with BEEST’s “Display Output Graphically” mode, you can also filter the MaxDCont Viewer display so that only values above a specified threshold are displayed.

We have a webinar introducing MaxDCont Viewer at Webinars → BEEST Suite. Click the “BEEST 11.05” link and go to the 2:30 mark. There is also a tutorial included in MaxDCont Viewer. Click Help → Tutorial on the menu bar.


We want to note that many folks use our classes as credit toward professional engineer continuing education requirements. Check with your state’s licensing board or the National Society of Professional Engineers (see here or here) for more information on what is required.

AERMOD Modeling for Permits

Our next scheduled AERMOD Modeling for Permits class will be August 24-25, 2021 and will be an online class. Sign up today and plan to join us in the virtual world! If you want to register, click here.

Advanced AERMOD

Similarly, our next scheduled Advanced AERMOD class will be August 26-27, 2021 and will also be online.

Advanced AERMOD covers those topics that are near and dear to modelers, such as:

  • NAAQS modeling for 1-hour NO2, 1-hour SO2 and 24-hour PM2.5 (including MaxDCont Viewer)
  • Meteorological data processing with AERMET / AERMINUTE / AERSURFACE
  • Changes related to the new Appendix W (Guideline on Air Quality Models)
  • MAXIFILE and ARRAY2 processing
  • AERMOD Wizard and its uses


To register for Advanced AERMOD, click here.

Don’t forget, if our schedule of classes doesn’t mesh with your schedule, or if you have several people that need to be trained at once, contact us about setting up an onsite class. Have laptop, will travel!

2021 Class Schedule

The rest of our 2021 classes are:

Class Dates  
AERMOD Modeling for Permits November 16-17, 2021  
Advanced AERMOD November 18-19, 2021  


Find the best dates that work for you and we’ll see you (virtually) then!



BeestXpress users have some great system enhancements to work with:

  • The “Job Details” webpage now displays the pollutant being modeled;
  • The “Job Details” webpage now displays run progress for MAXDCONT calculations;
  • Modeling runs with multiple partitions now include a combined AERMOD input file (*.DTA) in the output .ZIP file;
  • Added an option to the “Submit Job” webpage that affects modeling runs with multiple partitions: the intermediate output files created by each partition can be omitted from the output .ZIP file
  • The “Job Search” webpage now includes the option to search by project number
  • Users have access to up to 50 partitions per AERMOD run


To date, BeestXpress has processed over 400,000 AERMOD runs.

If you’ve never used BeestXpress, or it has been a while since you did, you may want to log on at to take advantage of our AERMOD “force multiplier”. That AERMOD run that might have taken a day to run on your desktop computer can finish in an hour or less on BeestXpress. When time is money, BeestXpress is the best modeling return on investment there is!

BeestXpress has been updated to run AERMOD 19191.

Meteorological Data Processing Services

Do you need AERMOD-ready or CalPuff-ready meteorological data? If so, we can help! Whether it’s running the AERMET / AERMINUTE system or a full CalMet run, Providence has the background, know-how, and experience to have your data processed and ready for you ASAP. Need on-site data processed? We do that, too! If you’d like more information, contact us at or

Consulting Solutions

One thing that we’re very proud of is the depth and range of our modeling experience and expertise. The kinds of air quality models we’ve used include all types, ranging from simple screening tools like SCREEN and AERSCREEN to plume models like ISC and AERMOD to CalPuff. The types of analyses included basic Significant Impact Level, NAAQS, PSD increment consumption, Class I analyses, air toxics, and SIP attainment demonstrations. So, we’ve seen it all. To that end, should you or your clients need additional modeling assistance or just a second set of eyes to QA or peer review your modeling (ranging from initial protocol up to final submission), we stand ready to help. Feel free to contact us at (512) 258-8855, (828) 628-0634 or



Calendar separator

June 14-17, 2021
AWMA Annual Conference and Exhibition

June 21-23, 2021
EPA Regional, State, and Local Dispersion Modelers’ Workshop

August 24-25, 2021
AERMOD Modeling for Permits

August 26-27, 2021
Advanced AERMOD