List of four air-borne microorganisms:- 1. Bacteria 2. Protozoa 3. Microalgae 4. Micro-Fungi. 1. Bacteria: Bacteria comprise a heterogeneous group varying in size from 0.3 to 10-15 µm and those bacteria that are capable of withstanding prolonged desication only can persist in air for long periods. Fortunately, such forms are saprophytic. Among these are sporulating […]