This is a basic test case with a stack source having 2 release heights and one building: Flat terrain, rural, downwash.
The GRAL test case was developed based on an AERMOD evaluation test case (EPA-454/R-03-003):
https://www.epa.gov/scram/air-quality-dispersion-modeling-preferred-and-recommended-models.
One should consider that observed and predicted hourly concentration values are highly chaotic and Arc-Max values are used to assess the model performance in this test case. Therefore, we use the average of the Arc-Max values of all experiments and arcs to assess the model quality.
Download the validation data set: Click to Download