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Modeling Tips

  • July 28, 2021

AERMOD View: PVMRM Bug in AERMOD 21112

The Plume Volume Molar Ratio Method (PVMRM) is one of several methods built into AERMOD for assessing the conversion of NOX to NO2. Originally developed by Hanrahan as a post-processor for the ISCST3 model, this conversion method is considered a Tier 3 screening method according to the Guideline on Air Quality Models (Appendix W to 40 CFR Part 51).

  • June 28, 2021

AERMOD View: Working with Different Model Versions

Numerous versions of the AERMOD model have been released over the years. These updates include new algorithms, enhancements to existing features, bug fixes, and more.

  • May 15, 2021

AERMOD View: Dispersion Options

The AERMOD modeling system has a variety of settings and options which can be employed in many ways. This includes options which have been pre-approved for use in regulatory applications and those which are meant for testing or may require additional approval in a regulatory context.

  • April 15, 2021

AERMOD View: Onsite Data in AERMET – Part 2: Data File Conventions

Last month, our tip described how AERMET reads custom meteorological data via its Onsite Pathway. AERMET’s Onsite Pathway gives users full control over how the model will read the data provided by the modeler, but there are some general conventions that must still be followed.

  • March 15, 2021

AERMOD View: Onsite Data in AERMET – Part 1: Formatting

AERMET – the meteorological pre-processor for the AERMOD modeling system – allows users to input their own custom meteorological data via its Onsite Pathway. This produces a highly representative dataset when using observations recorded at the site that will be modeled in AERMOD.

  • February 15, 2021

AERMOD View: Importing Gas & Particle Data

In addition to calculating air concentrations of pollutants, the AERMOD air dispersion model can calculate deposition fluxes from both particulate and gaseous emissions. When these routines are enabled, deposition parameters must be input to the model.