New AERMOD and AERMET released

Posted by on Friday, July 22nd, 2022 in Newsletters
What’s Happening Now

EPA News

EPA RSL Modelers’ Workshop – EPA hosted a virtual annual Regional, State and Local Dispersion Modelers’ Workshop back on July 12‑14, 2022. View the agenda for a listing of all the presentation slides.

*HOT* New AERMOD – On June 27, 2022, EPA released version 22112 of AERMOD. Changes include:

  • General Reaction Set Method (GSRM) moved from alpha to beta status
  • New alpha options added, including PLATFORM, RLINEFDH, TTRM2, and SWPOINT
  • Fixed bugs from version 21112 relating to:
    • Double counting of NO2 background concentrations when the PVMRM NOX-to-NO2 Tier 3 method is applied
    • Cases where concentrations from BUOYLINE sources would sometimes be reported as zero

– At the same time, EPA also released version 22112 of AERMET. Changes include:

  • AERMET now uses only two stages instead of three
  • You can actually run both stages in a single AERMET run
  • A new keyword, PROG, has been added to enable you to incorporate data from the Mesoscale Model Interface Program (MMIF)

For more details on the changes to AERMET, check out the revised user’s guide.

Conferences and Workshops

*HOT* 2022 Modeling Specialty Conference – The next AWMA modeling specialty conference will be held September 13‑15, 2022. This conference (dubbed “Guideline on Air Quality Models: Developing the Future”) will be held at the Sheraton Imperial Hotel in Research Triangle Park, North Carolina. This will be an in-person conference. For more information about the conference, go to A&WMA Air Quality Models Conference. We hope to see you at the conference!

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 12.08 is now out and includes the following:

  • Ability to create a building from buoyant line source inputs
  • Updated 3D View to display all source types (including buoyant line sources) as well as terrain
  • Fixed bug that limited the number of partitions for BeestXpress to fifty

We presented a webinar on the new features in this version of BEEST on July 6, 2022. Click here to watch the recording of the webinar.

As always, the next version of BEEST Is never far off. BEEST 12.09 will be out soon and will incorporate the new AERMOD 22112 and AERMET 22112 executables.

As always, users in maintenance can download the most recent version of BEEST from Support → Software Updates.

Go BEEST Mode face masks are here! 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

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.

We will be updating AerScreen for Windows to include AERMOD 22112 soon.

Professional CalPuff

Note to all Professional CalPuff users:

We are sorry to inform you that Providence/Oris has decided to end our support for Professional CalPuff. It was no longer available for purchase after May 31, 2022. We will continue to honor our support agreement until the end of your current maintenance period. If you have any questions for us about the program or any installation issues, we will be happy to help address these items while your maintenance period is active. After that, you may continue to use Professional CalPuff indefinitely without any additional maintenance fees, but also without any support from us. We will be able to supply new license keys in the future for customers who had active licenses as of May 31, 2022.


AERMOD Wizard 1.07 is out! This update has the following enhancements:

  • Allows you to download and process monitoring data for NOx
  • Allows you to download EPA monitoring data published in November 2021
  • Displays elevations for surface and upper air stations in the pop-up window
  • Warns you when data collection frequency changes within a monitoring data file
  • Allows you to set a custom radius when drawing circles around met stations, sources and monitors
  • Adds the ability to display sources from the National Emissions Inventory

The last one is very significant, as it allows you to quickly calculate emission totals within a defined radius of both an emissions source and a candidate ambient monitor. This becomes very useful when trying to identify a monitor for background purposes.

We presented a webinar on this exciting new version of AERMOD Wizard on March 24, 2022. If you missed it, you can watch the recording here.

AERMOD Wizard 1.08 will be out soon and will include the ability to download monitoring data through May 2022.

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

If you have suggestions for enhancements to any of our modeling software products, please let us know and we’ll do our best to incorporate them into the software.

Modeling Tip of the Month

Our tip this month is related to developing representative ambient background data using a new function in AERMOD Wizard. First, AERMOD Wizard 1.07 allows you to display all National Emissions Inventory (NEI) sources.

We can then add our source to AERMOD Wizard and have AERMOD Wizard draw a 10 km radius circle around our source.

Within our circle, we can place our cursor over our source, right-click and select “Sum NEI 10 km” and AERMOD Wizard will automatically identify all NEI sources within the circle.

AERMOD Wizard also automatically sums the criteria pollutant emissions occurring within the circle. Now, you have an idea of the emissions near your source.

You can center a circle around an ambient monitor and have AERMOD Wizard determine and display the emissions within 10 km of the monitor. Now you have a way to compare whether a particular monitor has the same or greater emissions total compared to the area around your source, bolstering your case for selecting the monitor for background purposes.

For more detail on this, check out our webinar on AERMOD Wizard 1.07.

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 AERMOD Modeling for Permits class will be August 23-24, 2022 and will be online. If you are wanting to get started in modeling, then this class is for you!

To register for AERMOD Modeling for Permits, click here.

Advanced AERMOD

Our next Advanced AERMOD class will be August 25-26, 2022 and will also be online.

Advanced AERMOD covers 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.

On-demand Meteorological Data Processing webinar

We are about to launch a new training option – on-demand webinars. The first of these to be released will be “Meteorological Data Processing for AERMOD”. Look for it at starting this fall.

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 your own onsite or online class.

2022 Providence/Oris class schedule

Here are the remainder of our scheduled 2022 AERMOD classes:

AERMOD Modeling for Permits
December 6-7 – online

Advanced AERMOD
December 8-9 – online

We will be announcing our 2023 class schedule in August.


*HOT* We’ve updated our BeestXpress service to include more – newer – faster processors!

If you’ve never used our super-fast BeestXpress before, now is the time. We have released an on-demand webinar that steps you through the process of setting up an account and sending off your first BeestXpress run. You can view the webinar here. New BeestXpress users can complete their first run absolutely FREE. Instructions about receiving the free run are given at the end of the webinar.

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 99 partitions per AERMOD run

To date, BeestXpress has processed over 500,000 AERMOD runs.

BeestXpress users can log on at to take advantage of our AERMOD “force multiplier”. That AERMOD run that might have taken a day or two to process 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!

Meteorological Data Processing Services

Do you need AERMOD-ready meteorological data? If so, we can help! Whether it’s running national weather service data or on-site monitor met data through the AERMET/AERMINUTE system, Providence has the background, know-how, and experience to have your data processed and ready for you ASAP. 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 include 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

August 23-24, 2022
AERMOD Modeling for Permits

August 25-26, 2022
Advanced AERMOD

September 13-15, 2022
AWMA Modeling Conference
Research Triangle Park, NC

Profound Thought of the Month

My grandmother is over 80 and still doesn’t need glasses. She drinks right out of the bottle. – Henny Youngman