AERMOD Wizard 1.06 is coming soon

Posted by on Tuesday, August 31st, 2021 in Newsletters


What’s Happening Now


EPA News

EPA Releases MMIF version 3.4.2 – EPA has released an update to the Mesoscale Modeling Interface program (MMIF). As you know, MMIF is able to take the output from prognostic meteorological models like the Weather Research and Forecasting model (WRF) and create either AERMOD-ready meteorological inputs or AERMET-ready “raw” meteorological data. MMIF can also support meteorological input development for the CalPuff and SCICHEM models. You can find MMIF here.

Otherwise, there’s nothing new to note on the EPA front since the June Regional, State and Local Dispersion Modelers’ Workshop. If you missed the workshop but would like to see the presentations, they are here.

Bugs found in AERMOD 21112 – Just a reminder that EPA confirmed the existence of two bugs in AERMOD 21112. The first is related to cases where the user invokes the Tier 3 Plume Volume Molar Ratio Method (PVMRM) for estimating NO2 impacts from NOX emissions. In this case, the background concentrations of NO2 provided via the AERMOD input file are added to the intermediate modeled concentrations twice, resulting in final modeled concentrations that are too high. When using the PVMRM option to model NO2, users should input background concentrations of NO2 that are one-half of the actual background concentrations.

The second bug is related to the use of the buoyant line (BUOYLINE) source in AERMOD. EPA notes that AERMOD will complete processing without an error but concentrations for BUOYLINE source types will not be generated or reported as zero. This can occur when one or more BUOYLINE sources are defined and the required BLPINPUT keyword is omitted, as well as the BLPGROUP keyword (not required in all circumstances). When all BUOYLINE source types defined in the input file are considered part of a single BLPGROUP, the BLPGROUP keyword is not required, and the BLPGrpID is an optional parameter for the BLPINPUT keyword. However, the BLPINPUT keyword is required. If the BLPINPUT keyword is also omitted, AERMOD will appear to complete successfully, but concentrations will not be generated for the BUOYLINE source types since the BUOYLINE source characteristics have not been specified via the BLPINPUT keyword and parameters. When modeling BUOYLINE source types, EPA recommends that the user include the BLPGrpID with the BLPINPUT keyword even when all BUOYLINE source types are modeled as a single BLPGROUP and assign each BUOYLINE source type to a BLPGROUP via the BLPGrpID parameter with the BLPGROUP keyword. Note: the updates to BUOYLINE sources are not incorporated in BEEST 12.06 but will be incorporated in BEEST 12.07.

Conferences and Workshops

As you might imagine, face to face meetings and conferences are currently rare, but good news is on the horizon! We encourage you to check organizations’ websites to find out the latest on upcoming conferences and workshops. In the meantime, here are a few that we know about:

AWMA Southern Section 2021 Annual Conference – The Southern Section’s Annual Meeting and Technical Conference will be held September 21-23, 2021 at the Beau Rivage Resort and Casino in Biloxi, MS. Keep watching for details.

AWMA Midwest Section 2021 Environmental Technical Conference – The Midwest Section’s annual technical conference will be held September 28-29, 2021 at the Lenexa Conference Center in Lenexa, KS. You can find details on it here.

AWMA Rocky Mountain States Section 2021 Air Quality Conference – This event is coming back to a live format on October 7, 2021 in Denver, CO. The call for abstracts is here and more information can be found at

AWMA Louisiana Section 2021 Annual Conference – The Louisiana section’s annual conference is also going live and in-person this fall. Plan to attend this on October 27-28, 2021 at the L’Auberge Casino and Hotel in Baton Rouge, LA. Find more information at

AWMA PNWIS Section 2021 Annual Conference – The Pacific Northwest International Section (PNWIS) of AWMA will be holding its 60th annual conference October 27-29, 2021 at the Coeur d’Alene Resort in Coeur d’Alene, ID. Find more information at

AWMA Lake Michigan States Section 2021 Annual Air Conference – This event will be in-person (and virtual) and will be held October 28, 2021. So, save the date and check back later at for more information.

AWMA ACE 2022 – As always, next year’s Annual Conference and Exhibition (ACE) is never that far off. ACE 2022 is back to being an in-person event and will be held in San Francisco, CA from June 27 to June 30, 2022 at the Hyatt Regency San Francisco. Watch for details.

Also, AWMA ACE 2023 will be held in Orlando, FL.

Upcoming Modeling Specialty Conference – Although it’s a bit early, there is a movement afoot to hold another AWMA-sponsored modeling specialty conference. It will most likely be in Research Triangle Park, NC and it’s looking to be in the fall 2022/spring 2023 timeframe.

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

CAPCA – The Carolinas Air Pollution Control Association (CAPCA) is also coming back live and in-person! The 51st Fall Technical Workshop & Forum will be held October 13-15, 2021, at the Hilton Resort @ Kingston, Myrtle Beach, SC. Watch for details.

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.



If you are generating MAXIFILEs in AERMOD, you probably noticed an error related to this when using BEEST 12.06. While this will be fixed in the full BEEST 12.07 release, we do have an interim version of BEEST that already has this fixed. If you need this version, email us at

We are currently working on BEEST 12.07, which will include the new ALPHA options found in AERMOD 21112.

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

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.


AERMOD Wizard 1.06 is coming soon. This update will have the following enhancements:

  • Allows you to download EPA ambient monitoring data published in May 2021
  • Includes AERMET 21112
  • Allows you to select the set of data to use when processing monitoring data files that contain multiple monitors at the same site
  • Fixes issue where the surface station list files contain multiple stations with same location but different IDs


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

This month, we turn our attention to AERMOD Wizard. One of the nifty little tools in AERMOD Wizard is the ability to generate forward and backward trajectories. Using AERMOD Wizard, you can read nearby meteorological data to calculate a forward trajectory from a source or a backward trajectory ending at a monitoring site. First, for a forward trajectory coming from a source, you’ll need to enter one using the right-click → Place Source command. Then, if you click on the Display Surface stations check box (on the left side of the screen in AERMOD Wizard), you can quickly identify which surface station is closest to your source and then download the year or years of meteorological data you want. You can download the routine Integrated Surface Hourly Database (ISHD) data. After you’ve downloaded the data, simply right-click the icon over the surface station and select Trajectory → Trajectory Set Up and put in the starting and ending time you want to see for your trajectory. In the General tab, select Forward Trajectory, ISHD, and Source (for the starting location). Then go to the ISHD tab to put in the time period you want for your forward trajectory. Once you’ve done that, just click Show and AERMOD Wizard plots the forward trajectory on the screen. You can also export the forward trajectory to Google Earth by clicking the Google Earth menu at the top of the AERMOD Wizard screen.

The process for creating backward trajectories with AERMOD Wizard is similar. You can use the on-screen display to show what ambient monitor you want the backward trajectory to end at and then identify which meteorological station is closest to it. As before, you can then download the ISHD data. Then, you still right click the icon over the surface meteorological station and click Trajectory → Trajectory Set Up. This time, on the General tab, select Backward Trajectory, and put in the coordinates (either Latitude/Longitude or UTM) of the ambient monitoring station. (Hint: if you place your mouse over the monitor’s icon, the lat/lon and UTM coordinates are at the top of the yellow pop-up box.) In the ISHD tab, enter your beginning and ending times as before and then click Show. AERMOD Wizard plots the backward trajectory (ending at the ambient monitor) on-screen, and you can also export it to Google Earth. As we said, quite nifty.


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 November 16-17, 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 November 18-19, 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 your own onsite or online class.

Look for our 2022 schedule of classes in the September issue of Providence/Oris Notes.



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 450,000 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 now runs AERMOD 21112.

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



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September 21-23, 2021
AWMA Southern Section 2021 Annual Conference
Biloxi, MS

September 28-29, 2021
AWMA Midwest Section 2021 Environmental Technical Conference
Lenexa, KS

October 7, 2021
AWMA Rocky Mountain States Section 2021 Air Quality Conference
Denver, CO

October 13-15, 2021
CAPCA Fall Technical Workshop & Forum
Myrtle Beach, SC

October 27-28, 2021
AWMA Louisiana Section 2021 Annual Conference
Baton Rouge, LA

October 27-29, 2021
AWMA PNWIS Section 2021 Annual Conference
Coeur d’Alene, ID

October 28, 2021
AWMA Lake Michigan States Section 2021 Annual Air Conference

November 16-17, 2021
AERMOD Modeling for Permits

November 18-19, 2021
Advanced AERMOD

Profound Thought of the Month: Anyone can win, unless there happens to be a second entry. – George Bernard Shaw