is available to you when you check the Building Downwash box in the
Summary Panel. This option is only applicable to Point and Flare sources. Downwash occurs when
the aerodynamic turbulence induced by nearby buildings cause a pollutant emitted from an elevated
source to be mixed rapidly toward the ground (downwash), resulting in higher ground-level
concentrations. For more information on building downwash screening procedure see the next
section (Downwash Screening Procedure).