The effect of fine dust (suspended particles) is considered on the thermosolutal convection. The principle of exchange of stabilities is satisfied for thermal Rayleigh number greater than or equal to solute Rayleigh number. If the solute Rayleigh number exceeds the thermal Rayleigh number, the oscillatory modes may come into play. The effect of stable solute gradient has a stabilizing effect whereas the effect of suspended particles is to destabilize the layer. The effect of a uniform rotation is also considered and is found to have a stabilizing effect in the presence of suspended particles on the thermosolutal convection.