Date ______
Subject 4. METHODS OF HYGIENIC ESTIMATION OF AIR
CONDITIONING AND VENTILATION OF ROOMS. METHODS OF
INVESTIGATION AND HYGIENIC
ESTIMATION OF DUSTINESS AND CHEMICAL POLLUTION OF AIR
Student _______________________________________________________________
(full name)
Number of group _________________________________________________________
1. Main chemical substances what change natural composition of indoor air:
1.1. Substances of antropogenic origin
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1.2. Toxic substances of domestic and construction origin
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2. Main indices of ventilation
2.1 Direct indices
The ventilation volume (definition)
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The air movement ratio (definition)
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2.2. Indirect indices
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3. Hygienic characteristics of main air domestic and construction pollutants.
3.1. Carbon monoxide
3.1.1. The sources of carbon monoxide in the indoor air
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3.1.2. Influence of carbon monoxide on the human organism
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3.2. Phenol
3.2.1. The sources of phenol in the indoor air
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3.2.2. Influence of phenol on the human organism
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3.3. Formaldehyde
3.3.1. The sources of formaldehyde in the indoor air
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3.3.2. Influence of formaldehyde on the human organism
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3.4. Dust
3.4.1. The sources of dust in the indoor air
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3.4.2. Influence of dust on the human organism
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Situational task 1
Sanitary investigation of the air in classroom of secondary school was carried out on
12.09.20___ at 1100 (after three lessons). Estimate clearness of the air in classroom if
such results were drawn: CO2 concentration is 0.3 %, CO concentration is 2.0 mg/m3,
phenol concentration is 0.01 mg/m3, formaldehyde concentration is 0.05 mg/m3, content
of dust is 0.2 mg/dm3, microbial number is 2,750 per m3, number of Streptococcus
haemolitycus is 15 per m3 .
Solution of the situational task
Index
Hygienic standard
Actual data
Assessment
CO2
CO
phenol
formaldehyde
dust
microbial number
Streptococcus haemolitycus
Conclusion
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Situational task 2
Sanitary investigation of the air in hostel corridor was carried out on 23.09.2019.
Estimate clearness of the air in this premise if such results were drawn:
CO2 concentration is 0.6 %, CO average day concentration is 3.8 mg/m3, phenol
concentration is 0.01 mg/m3, formaldehyde concentration is 0.05 mg/m3, ammonia
average day concentration is 0.03 mg/m3, SO2 average day concentration is 0.07 mg/m3,
content of dust is 0.2 mg/dm3.
Solution of the situational task
Index
Hygienic standard
Actual data
Assessment
CO2
CO
phenol
formaldehyde
ammonia
Sulphureous gas (SO2)
dust
Conclusion
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Situational task 3
There are the following dust particles on the filter AFA (total number – 150):
Dust particles of size to 0.1 µ= 30.
Dust particles of size from 0.1 to 1 µ = 35.
Dust particles of size from 1.1 to 5 µ = 45.
Dust particles of size from 5.1 to 10 µ = 25.
Dust particles of size from 10 µ and more = 15.
Calculate the dust formula and give the conclusion about the degree of dust
dispersion.
Dust formula
Size of dust
particles
Quantity of dust
particles (in absolute
figures)
In %
Type by classification
To 0.1 µ
from 0.1
to 1 µ
from 1.1
to 5 µ
from 5.1
to 10 µ
more than
10 µ
Conclusion
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