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Also Read This Useful Articles:
►Fungi
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►Basement
Mold Mildew Remediation Protocol
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Dampness
and Inadequate Ventilation are Two Causes of Microbial Pollution
From the World
Health Organization in its report WHO Guidelines for
Indoor Air Quality: Dampness and
Mould, published July 16, 2009
The presence of many
biological agents
in indoor environments is attributable
to dampness and inadequate ventilation.
Excess moisture on almost all indoor materials leads to growth of
microbes, such as mould, fungi and bacteria, which subsequently emit
spores, cells, fragments and
volatile organic compounds into indoor air. Moreover,
dampness initiates chemical or biological degradation of materials, which
also pollute indoor air. Dampness has therefore been suggested to be
strong, consistent indicator of risk of asthma and respiratory symptoms
(e.g. cough and wheeze). The health
risks of biological contaminants of indoor air could thus be addressed by
considering dampness as the risk indicator. Several widely acknowledged
global trends contribute to the conditions associated with increased
exposure to dampness and mould:
►energy
conservation measures
that are not properly implemented (tightened
building envelopes, ventilation
deficits, improper insulation);
►urbanization
(migration, building type and density, urban degradation, housing
availability and
social inequity);
►climate
change (increasing
frequency of
extreme weather conditions, shifting
of
climate zones); and
►the
quality and globalization of
building materials and
components, construction
concepts and techniques.
These conditions increase the risks of adverse health effects due to
biologicalcontaminants of indoor air.
Airborne
Mold Spores (colony-forming units)
The airborne concentrations of viable fungi in indoor environments
are usually in the order of a few to several thousand colony-forming units
(CFUs) per cubic metre
of air. In a given space, concentrations of fungi are highly variable and
depend on such factors as: climate and season, type of fungus,
construction, age and use of the building, and ventilation rate. They also
depend largely on the sampling and analytical methods used, making valid
comparisons between studies difficult. ------from the
World
Health Organization in its report WHO Guidelines for
Indoor Air Quality:
Dampness
and Mould, published July 16, 2009
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