Aerosol Initial Conditions and Size Distribution

Hi,

I’m relatively new to WRF-CMAQ and in the process of setting up some runs. Is it possible to prescribe an initial aerosol size distribution for a specific aerosol (i.e. sea spray/dust) in a grid cell/layer, or as a point source? For example, an initial aerosol layer of 10-micron-diameter dust in a specific grid and layer?

Thanks!