TCEQ Environmental Trade Fair is back

Posted by on Tuesday, January 18th, 2022 in Newsletters


What’s Happening Now


Holiday Quiz Answers

Our annual end of year bit of fun, aka the Holiday Quiz, is over. Thanks to everyone who played. Here are the answers to the questions:

1. Which of these programs is NOT used during meteorological data processing for AERMOD?

  5. All of these programs are used in processing meteorological data


The correct answer is b. AERMAP is not used during meteorological data processing.

2. Which tool(s) can be used to greatly speed up AERMOD run times?

  1. Local computer partitioning
  2. BeestXpress
  3. Terrain Files Converter
  4. a. and b.
  5. b. and c.


The correct answer is d. Both local computer partitioning and BeestXpress can speed up your AERMOD runs.

3. AERMOD is to Gaussian plume model as CalPuff is to:

  1. Dense gas model
  2. Eulerian grid model
  3. Lagrangian puff model
  4. Screening tool
  5. a. and d.


The correct answer is c. CalPuff is considered a Lagrangian puff model.

4. Every year, EPA holds an RSL Modelers’ Workshop. What does RSL stand for?

  1. Rapid Scale Limnology
  2. Really Smart Linux
  3. Related Special Lagrangian
  4. Regional State Local
  5. Reported Screening Level


The correct answer is d. Regional State Local.

5. AERMOD Wizard is an incredibly effective utility for air quality modelers. Which of the following can AERMOD Wizard NOT do?

  1. Conduct Q/D analyses for multiple Class 1 areas
  2. Calculate impacts of secondary PM2.5 and ozone based upon EPA’s MERPs (Modeled Emission Rates for Precursors) modeling
  3. Download and process ambient monitoring data into AERMOD-ready background data
  4. Download raw meteorological data and then call/run AERMINUTE and AERMET
  5. Generate wind roses and pollution roses and export them to Google Earth
  6. Generate forward and backward trajectories from meteorological data and export them to Google Earth
  7. AERMOD Wizard can actually do all of these


The correct answer is g. AERMOD Wizard can do all of the items listed.

EPA News

New Version of AERMET

Don’t forget, EPA has released a new draft version of the AERMET processor, called 21DRF, for review and comment by the user community. Although there were a couple of bug fixes associated with this new version, this version is a major programming overhaul of AERMET. These changes include:

  • Complete code rewrite, using more modern programming approaches
  • Changing from three stages to two stages
  • A new pathway, PROG, for processing prognostic model-based inputs
  • The XDATES keyword has changed from 2-digit to 4-digit years
  • The TD-3280 data format has been dropped
  • And more


The new executable, user’s guide, source code, and test cases can be found at Draft AERMET. EPA is taking comments from the user community and would like to receive all comments by February 7, 2022.

New Version of MMIF

EPA has released version 4.0 of the Mesoscale Model Interface program (MMIF). It can also be found at Draft AERMET.

Other News

Modeling for Non-Modelers Class – Given the importance that modeling plays in demonstrating compliance, we think that all stakeholders of the air quality permitting team (client/applicant, permit application preparer, modeler, attorney, etc.) need to have a basic understanding of air quality modeling. Do you know a manager, an attorney, or a client who knows just enough about dispersion modeling to be dangerous? Wouldn’t it be better if that person knew enough about dispersion modeling to understand the basic modeling process and regulatory drivers, knew how to interpret modeling results and knew when it was necessary to bring a modeling expert into the decision-making process? If so, our Modeling for Non-Modelers class is for them. This 1-day class doesn’t get into the nitty gritty of running the model, but it does familiarize students with enough of the process so that they can make informed decisions when it comes to dispersion modeling. We are tentatively planning to present this class during the first half of 2022. For more information, email us at

Conferences and Workshops

As you might imagine, face to face meetings and conferences are currently rare, but we think that good news is on the horizon! We encourage you to check organizations’ websites to find out the latest on upcoming conferences and workshops.

AMS 102nd Annual Meeting – The 2022 annual meeting of the American Meteorological Society (AMS) was supposed to be live and in-person in Houston, Texas January 23‑27, 2022. However, like many events these days, it has been overcome by COVID Omicron events and will now be virtual. The meeting will include the 22nd Joint Conference on the Applications of Air Pollution Meteorology with the A&WMA. For more information regarding registration, sessions, etc. please go to 2022 AMS Annual Meeting.

The 2023 AMS annual meeting will be held January 8-12, 2023 in Denver, CO.

AWMA ACE 2022 – The AWMA’s Annual Conference and Exhibition (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. Check A&WMA Annual Conference 2022 for conference details.

AWMA ACE 2023 is slated to 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. We should know more after this year’s ACE 2022.

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

Texas Environmental Trade Fair – It’s back! As it stands now (mid-January 2022), the 2022 Texas Commission on Environmental Quality’s (TCEQ) Environmental Trade Fair is set to go live and in-person May 10-11, 2022 at the Austin Convention Center in Austin, Texas. There will be sessions on air and water permitting, waste management, oil/gas, and more! Providence will be there and we hope to see you there, too! For more information, go to Environmental Trade Fair and Conference.

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 12.07 is now out and includes the following:

  • Updated BEEST based on new keywords and alpha options found in AERMOD 21112
  • Added a warning to DTA Diagnostics when filenames contain characters that cause AERMOD to crash
  • Fixed bug where DTA Diagnostics screen says that there’s a duplicate average/group when there are multiple MAXIFILE output files
  • Raised the limit on the number of partitions for BeestXpress to 99
  • Added a search text box to the Find form opened from the right-click menu
  • Included a new version of WindRose
  • And more


We presented a webinar on version 12.07 on January 11, 2022. If you missed it, you can watch the recording here.

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.

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 now out. This update has the following enhancements:

  • Allows you to download EPA ambient monitoring data published in May 2021
  • Now runs AERMET 21112
  • Allows you to select the set of data to use when processing monitoring data files
  • Fixes issue where the surface station list files contain multiple stations with same location but different IDs
  • Includes a new version of WindRose


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

Area sources can be tricky to model, but BEEST has you covered. In AERMOD, the emission rate for an area source (whether rectangular, circular or polygon) must be input in terms of mass per unit time per unit area (g/s/m2). However, we generally calculate our emission rates based on a process that is just in terms of mass per unit time (g/s, lb/hr or tpy). If you go to File → Preferences → Misc 1, you can tell BEEST that your inputs are in mass per unit time, and then BEEST will automatically divide that rate by the area of the source and write the rate in g/s/m2 to the AERMOD input file.

In addition, if you are curious to know what the actual area of your area source is, you can hover the cursor over the anchor point of the source and BEEST tells you the area.


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 February 15-16, 2022 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

Our next scheduled Advanced AERMOD class will be February 17-18, 2022 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.

2022 Providence/Oris class schedule

Here are the remainder of our scheduled 2022 AERMOD classes:

AERMOD Modeling for Permits
May 17-18 – location TBD
August 23-24 – location TBD
December 6-7 – location TBD

Advanced AERMOD
May 19-20 – location TBD
August 25-26 – location TBD
December 8-9 – location TBD

Even though locations have not been firmed up for all of the 2022 classes, we are currently anticipating some of these will still be virtual; hopefully, some will be in‑person.



If you’ve never used our super-fast BeestXpress before, now is the time. We have just released a brand new 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 with up to 50 partitions 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 50 partitions per AERMOD run


To date, BeestXpress has processed over 450,000 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!

BeestXpress now runs AERMOD 21112.

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

January 23-27, 2022
102nd Annual Meeting of the American Meteorological Society

February 15-16, 2022
AERMOD Modeling for Permits

February 17-18, 2022
Advanced AERMOD

May 10-11, 2022
TCEQ Environmental Trade Fair
Austin, TX

May 17-18, 2022
AERMOD Modeling for Permits
Location TBD

May 19-20, 2022
Advanced AERMOD
Location TBD

June 27-30, 2022
San Francisco, CA

Profound Thought of the Month: No man goes before his time – unless the boss leaves early. – Groucho Marx