Better Inputs for AERMOD
In many cases, AERMOD will over-predict concentrations. This is because BPIP, the standard tool for determining building dimension inputs, handles many situations poorly. For example, in some cases BPIP will:
- Merge nearby buildings into a single building
- Ignore or misrepresent lattice structures
- Mishandle buildings with a low, large footprint or complex geometry
- Ignore the effects of terrain
CPP’s Equivalent Building Dimension (EBD) procedure avoids these mistakes by starting with an accurate model of the actual site. By testing the scale-model plume behavior, CPP experts can identify the right AERMOD-ready dimensions that match the scale-model tests. The EBD method provides more accurate, and often lower, concentration estimates.
A scientifically-based, empirically-validated tool like EBD provides advanced modeling to facilitate the permitting process while protecting air quality. In some cases, it can offer new life to projects that have been stalled by older modelling methods.