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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. |
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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
Read this very helpful article:
►Fungus
and Fungal Growth
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