Origin and Species Diversity
The air environment contains no nutrients and is unfavorable for microorganism reproduction. For this reason, air microflora is exclusively secondary in nature. Bacteria, fungi, and viruses do not live here permanently; instead, they are temporarily transported by wind currents, dust, or liquid droplets. The main sources of atmospheric contamination include soil, open bodies of water, and the skin and mucous membranes of humans and animals.
Despite their temporary (transient) status, the morphological diversity of the aerial environment is extremely high. Practically all life forms of the microbial world can be found in air samples. These include various cocci, non-spore-forming rods, bacilli, clostridia, actinomycetes, as well as microscopic fungi and viruses.
Survival Factors and Geographic Distribution
The viability of microbial cells in the open atmosphere is severely limited. The main physical factor causing the mass destruction of microorganisms in the air is direct solar insolation. Natural ultraviolet radiation destroys cellular structures, preventing the global spread of many infections.
Microbial distribution shows a distinct geographic pattern:
- Maximum concentration is always registered in large cities due to high population density, abundant dust, and environmental pollution.
- Minimum concentration is observed over ecologically clean zones: forests, mountain ranges, and seas, where the air is naturally purified.
Characteristics of Indoor Microflora
Inside buildings, a specific ecological environment is formed. The quantitative and qualitative composition of indoor microflora directly depends on the maintained sanitary regime. Key parameters determining air purity include the frequency of cleaning, ventilation intensity, natural lighting levels, and, most importantly, human crowd density. The more people in an enclosed space, the higher the concentration of microorganisms.
Sanitation and Air Purification Methods
To reduce the microbial load in medical, laboratory, and public facilities, a strict set of sanitation methods is applied. The basic and mandatory method is regular wet cleaning, which prevents the resuspension and circulation of bacteria-bearing dust.
Specialized sanitation methods include:
- UV irradiation: the use of germicidal lamps to destroy microorganisms.
- Aerosol disinfection: spraying antiseptic substances.
- Filtered ventilation: creating streams of purified air. This method is critically important for rooms with the highest sterility requirements, such as surgical suites and microbiological laboratories.