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Rain and Electrostatic Deposition
Rainfall deposition occurs as a condensation reaction between a raindrop and bio-aerosol which combine and create a bio-aerosol with a greater mass which settles faster. Electrostatic deposition also condenses bio-aerosol but is based on electrovalent particle attraction (on charges found outside the aerosol). All particles tend to have some type of associated charge. Microbes have an overall negative charge associated with their surface (at neutral pH). These negatively charged particles can associate with other positively charged aerosols resulting in electrostatic condensation thus increasing the bio-aerosol mass and enhancing deposition.