2.1Īir micro flora significance in human health: Human being inhales air every moment. Microorganisms in the air are evaluated using tow different air samplers and plate counting. In this site, some important respiratory diseases and the role of airborne spores in crop disease caused by airborne microbes, and methods for monitoring spores in the air. This article gives a range of how microorganisms can be dispersed into the air and the different places they can come from. This article gives a description about the origin of micro organisms in air
These are discharged through human activities like coughing, sneezing, laughing and even talking. But the main source of micro organisms is human beings. Micro organisms from plant and animal surfaces are also transferred by air currents. Organisms can also be released in the form of water droplets or aerosols which are produced by wind or tidal actions. Another way of transferring micro organisms to the air is by manmade actions like plugging and digging. Whenever the wind blows it disturbs the micro organisms and liberate them into the air and these micro organisms remains suspended in the air for long time. Soil is one of the source to transfer micro organisms to the air. The origin of the micro organisms takes place through various ways. Thus if the micro organisms are not protected from desiccation, almost most of the organisms will die. The air in the atmosphere is often exposed to sunlight thus it contains less moisture and higher temperature.
Usually most of the organisms are found in the lower region of atmosphere.
All these characters make the atmosphere unsuitable for growth of micro organisms. The characteristics of atmosphere as a habitat include extreme temperature variations, light, temperature, low amount of available water and organic water. Air found in school and hospital or living places of the person suffered from infectious disease usually found microbes like tubercle bacilli, streptococci and pneumococci. Organisms found below 500 feet is mainly in overpopulated area, these include spores of Bacillus and Clostridium, ascospores of yeast and fragments of mycelium, mould, streptomycetaceae, pollen, protozoan cysts, algae, Micrococcus and corynebacterium. Fungal spores which are found in air consist of Alternaria, Cladosporium, Penecillium and Aspergillus found above 4000 feet from the land, found in both polar and non polar air masses. Microbes normally found in atmosphere within 300-10000 feet above from the land. This is based on New Zealand Qualification Authority Unit 12460 entitled "Demonstrate knowledge of the microbiology of air."
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