New Modeling Tip of the Month

Posted by on Monday, March 23rd, 2020 in Newsletters

What’s Happening Now

EPA News

*HOT* EPA has just announced cancellation of the 2020 Regional, State, and Local Modelers’ Workshop.

*HOT* New Draft Permit Modeling Guidance – EPA recently released for comment DRAFT Guidance for Ozone and Fine Particulate Matter Permit Modeling. This guidance can be found here and EPA is accepting comments from the stakeholder community until April 17, 2020.

EPA hosted a webinar on the new draft guidance on March 12, 2020 and the slides from that presentation may be found here.

Conferences and Workshops

Here’s the latest…

New Source Review Workshop – The AWMA New Source Review Workshop, previously set for March 18-19, 2020 in Atlanta, GA has been rescheduled for September 1‑2, 2020 and will still be at the Doubletree Hilton Atlanta Airport. For details, go to

CAPCA Technical Workshop and Forum – The Carolinas Air Pollution Control Association’s (CAPCA) spring Technical Workshop and Forum, originally scheduled for April 15‑17, 2020 in Asheville, NC, has been cancelled.

AWMA Gulf Coast Annual Chapter Meeting – This conference, scheduled for April 16, 2020 in Houston, TX has been postponed. Watch for an announcement of a new date.

TCEQ Environmental Trade Fair – The 2020 TCEQ Environmental Trade Fair has been canceled.

AWMA Rocky Mountain States Section Air Quality Conference – May 14, 2020 at the Denver Marriott West hotel in Golden, CO.

And, of course, the biggie this year will be the AWMA Annual Conference and Exhibition (ACE), which will be held June 29 – July 2, 2020 in San Francisco, CA. For more details on this year’s ACE, go to

If your company, organization, agency, State, etc. has an upcoming modeling or air quality-related event 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.

Simply the Best!

New Price Lists

Effective June 1, 2020 the new prices for BEEST Suite and AerScreen for Windows will be:

  BEEST AerScreen for Windows
  New Renewal New Renewal
Single-user $1,450.00 $725.00 $520.00 $260.00
Multi-user $2,900.00 $1,450.00 $1,040.00 $520.00


There will be no price changes for Professional CalPuff, AERMOD Wizard, SLAB for Windows, INPUFF2 for Windows and 112r Suite.


BEEST 12.02 is now out and includes these updates:

  • Removed guidance documents for older versions of AERMAP, AERMET, AERMINUTE and AERMOD from the Help → "Guidance Documents" form in BEEST. These documents are still available at
  • Fixed a bug where BEEST removed all sources when the user drew a rectangle or polygon and selected the option to remove sources inside the rectangle or polygon

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

"Go BEEST Mode!" — What? You still don’t have your own "Go BEEST Mode" t-shirt? Don’t worry, we’ve got plenty left – so email your request to and receive your very own "Go BEEST Mode" T-shirt! You’ll be the envy of modelers everywhere!

AerScreen for Windows

Since AerScreen for Windows uses AERMOD, we have released AerScreen for Windows 4.00. Version 4.00 fully supports AERMOD 19191 and also includes an updated website link for downloading terrain data and the Terrain Files Converter utility.

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 on 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 1.03 is now here! It includes these enhancements:

  • Ability to do Modeled Emission Rates for Precursors (MERPs) analyses for ozone and secondary PM2.5 across the continental United States
  • Support for downloading EPA monitoring data published in November 2019
  • Support for downloading met data files for 2020
  • Ability to change from wind directions to flow vectors in the Pollutant Rose form
  • The center of the pollutant rose defaults to the monitoring station instead of the met station

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

*We’re off to see the Wizard!*

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

Recently, the US Geologic Survey changed the types of elevation data that can be downloaded from the National Map Viewer website ( As you may recall, USGS took down all access to NED data in GeoTIFF format, necessitating users to download NED data in ArcGrid format and then converting it to GeoTIFF using the Terrain Files Converter utility. Then around the first of March, the National Map download site changed so that *only* GeoTIFF formatted NED data was available. Unfortunately, due to a data compression issue, these new GeoTIFF files will not work in AERMAP. However, there is a work-around. If you browse to the USGS Staged Products Directory, you can get the 1 arc-second and 1/3 arc-second elevation files in ArcGrid format. Go to and then navigate as follows:

For 1 arc-second ArcGrid data, go to Elevation → 1 → ArcGrid and then select the zipped file you need. These files are in 1×1 degree tiles.

Similarly, for 1/3 arc-second ArcGrid data, go to Elevation → 13 → ArcGrid and select the zipped file you need. These files are also in 1×1 degree tiles.

Regarding the naming convention of the 1×1 degree files, the numbers listed in the file name alongside "n" and "w" (e.g. refer to the north-most latitude (35 degrees) and west-most longitude (82 degrees) of the tile. After you download the files you need, just follow the instructions for converting ArcGrid to GeoTIFF using Terrain Files Converter.

“Our expertise is contagious. Catch it!”

Beginning with our September 2020 AERMOD classes, a new course fee pricing structure will go into effect. If a student registers more than one month before the start of class, the course fee will still be $995. If a student registers less than one month prior to the start of class, the fee will be $1,095 per student. As before, if more than one student from an office/company registers for a class, each of those registered students will have a $100 discount applied to their course fee(s). Other discounts, such as those for government air agency staff, will still be available.

AERMOD Modeling for Permits

Our next scheduled AERMOD Modeling for Permits class for 2020 will be May 19-20 in Austin, TX. Register today and plan to join us in the Live Music Capital of the World. Click here to register!

Advanced AERMOD

Similarly, our next scheduled Advanced AERMOD class for 2020 is going to be May 21-22, also in Austin.

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 alpha options, such as PSDCREDIT
  • AERMOD Wizard and its uses

Click here to register!

**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 on-site class. Have laptop, will travel!**

2020 Class Schedule

The rest of our scheduled classes for 2020 are:

Class Dates
AERMOD Modeling for Permits September 15-16, 2020
Advanced AERMOD September 17-18, 2020
AERMOD Modeling for Permits December 1-2, 2020
Advanced AERMOD December 3-4, 2020



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 350,000 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 SCREEN3 and AERSCREEN to plume models like ISC and AERMOD to CalPuff to CAMx. The types of analyses included basic Significant Impact Level, NAAQS, PSD increment consumption, Class I analyses, air toxics, and SIP attainment demonstrations. Most recently, we have begun conducting nonattainment permit inter-pollutant trading (NOx for VOC) modeling using CAMx. 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 or



Calendar separator

May 14, 2020
AWMA Rocky Mountain States Section Air Quality Conference
Golden, CO

May 19-20, 2020
AERMOD Modeling for Permits
Austin, TX

May 21-22, 2020
Advanced AERMOD
Austin, TX

June 29 – July 2, 2020
AWMA Annual Conference and Exhibition (ACE)
San Francisco, CA

September 1-2, 2020
AWMA New Source Review Workshop
Atlanta, GA