VietNamNet Bridge – The people working at offices and self-contained buildings are prone to some diseases of headache or inflammation because of the regular inhalation of volatile organic compounds arising from printers, wooden furniture or paints.
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Ngo Quoc Khanh, MA, from the Research Institute for Labor Protection Science and
Technique and his associates have completed the research work on assessing the
labor environment and the health of the workers at office buildings.
The researchers conducted a survey on six companies with the offices located at
four buildings in Hanoi. The common characteristic of the office buildings is
that they are self-contained with a central air-conditioning system. These
buildings all bear the current typical modern design. The workers at the
buildings all have high education levels and they are young.
Since there have been no official standards on the air quality for the offices
in Vietnam, the researchers compared the indicators they found at the buildings
in Vietnam with foreign standards. What they have found is that the noise
concentration is a bit higher than the allowed level, but it does not seriously
affect the workers’ health.
However, the researchers have found other big problems in microbiological
factors and volatile compounds, pointing out that these are the factors which
most affect the office workers’ health.
The volatile organic compounds (VOCs) include formaldehyde, benzene, toluene,
acetone arisen from office equipments such as printers, computers, copiers,
furniture cleaners.
In general, in order to clean floors and equipments, people use some kinds of
chemicals, but it is the chemicals which cause the environment pollution.
Meanwhile, it is a growing tendency that filing cabinets and office furniture
are made of industrial wood, adhesives and paints which are the main sources of
VOCs.
The experts have also pointed out that the frequent and long lasting exposure to
the VOCs would seriously affect workers’ health.
VOCs are the substances capable to dissolve the blood fat easily, thus making it
easier to be absorbed through the lungs and gets into the brain, which would
cause the central nervous system to decline; causing fatigue, drowsiness and
discomfort.
In principle, the VOCs’ influences on human would be different depending on the
VOC concentrations. With the VOC concentration of less than 0,2mg/m3, people
would not have the sense of discomfort.
Meanwhile, with the VOC concentration at 0.2 - 3.0 mg/m3, this would cause
discomfort and irritation, at 3.0 - 25mg/m3 causing headache and contrast mild
inflammation, above 25mg/m3 causing neurotoxicity (self, fatigue, confusion,
etc.).
The VOC concentrations may vary at different floors of the same buildings. The
administrative department always has the VOC concentrations higher than in other
departments.
Dr. Phung Van Khoa from the Hanoi Forestry University, especially has given
warning about toluene, a volatile organic solvent, now being widely used in
industries. Paints, cleansing liquid could be the main sources of toluene at
home or office.
Khoa said that one of the most effective solutions to ease the toluene
concentrations is Phytoremediation, which means putting the plants which can
absorb the pollutants to ease the risks for people.
Khoa and his associates Bui Van Nang, MA, and Nguyen Thi Bich Hao, MA, have
found out that three plants Thiet Moc Lan (Dracaena fragrans), Ngu gia bi (Araliaceae),
Duong xi thuong (Cyclosorus parasiticus (L.) Farw) have these features.
Within 72 hours, Thiet Moc Lan can absorb 2,7µg/cm2, ngu gia bi 1,20µg/cm2.
Especially, the plants can be put in houses as ornamental trees.
VNE