Micro organisms in air

1. Protozoa

1.1. Transported from cysts- Irregular plasmodial shape

1.1.1. Cysts ranging from 2-50 µm in diameter

1.2. Not in cyst condition -Rigid flattened or ovoid

2. Microalgae

2.1. Airborne due to air currents in absence of adaptation for take off into air.

2.1.1. Airborne microalgae

2.1.1.1. Algal cysts

2.1.1.2. Other resting stages

2.1.1.3. Chlamydomonas

2.1.1.4. Chlorococcum

2.1.1.5. Gongrosira

2.1.1.6. Phormidium

2.1.1.7. Protococcus

2.1.1.8. Diatoms

2.1.1.9. Spirogyra

2.1.1.10. Oscillatoria

2.1.1.11. Chlorella

2.1.1.12. Amphora

2.1.1.13. Cyanobacteria(Blue green algae)

2.1.1.13.1. Aulosira

2.1.1.13.2. Lyngbya

2.1.1.13.3. Nostoc

3. Bacteria (heterogenous group varying in size from 0.3 to 10-15µm)

3.1. Saprophytic bacteria

3.1.1. Sporulating bacteria

3.1.1.1. Bacilli, cocci like

3.1.1.1.1. Sarcina

3.1.2. Non sporulating bacteria

3.1.2.1. Rods

3.1.2.1.1. Serratia

4. Microfungi

4.1. Fungal Spores (Propagative phase)

4.1.1. Density in still air approximately 1.0

4.1.1.1. Able to remain suspended in atmosphere

4.1.1.2. become disseminated through action of turbulent air movement