COMMUNITY MEDICINE

1. AIR & AIR POLLUTION
SUDARSAN

2. INTRODUCTION
• Air is essential for maintenance of life. The
immediate environment of man comprises of air
on which depends all forms of life

3. Definition
• Air is mixture of gases that forms environment

4. Composition of air
• Mechanical mixture of gases
- Nitrogen = 78.1%
- Oxygen = 20.93%
-CO2 = 0.03%

5. FUNCTIONS OF AIR
 Interchange of gases
 Thermo regulation
 Medium for communication
 Medium for spread of pollens & bacteria
 Helps functioning of auditory & olfactory
organs

6. AIR OF OCCUPIED ROOM
 Chemical changes
 Physical changes

7. DISCOMFORT ZONE
• It is subjective sensation which the people
experience in ill ventilated and crowded rooms

8. COMFORT ZONE
• The range of effective temperature over which
majority of individuals feel comfortable

9. CORRECTED EFFECTIVE TEMPERATURE
(DEG C)
PLESANT & COOL 20
COMFORTABLE AND COOL 20-25
COMFORTABLE 25-27
HOT & UNCOMFORTABLE 27-28
EXTREMELY HOT 28+
INTOLERABLY HOT 30+

10. PREDICTED FOUR HOUR SWEAT RATE
(p4 sr)
Comfort zone 1-3 litres
Just tolerable 3-4.5 litres
intolerable 4.5+

11. AIR POLLUTION
DEFINITION:
It is the condition when there is
excessive concentration of foreign matter in the
outdoor atmosphere which is harmful to man or
his environment

12. CAUSES OF AIR POLLUTION
 Industrial sources
 Domestic sources
 Scientific research
 Transportation
 Other sources…

14. AIR POLLUTANTS
 More than 100 are identified
 CO
 Sulphurdioxide
 Lead
 Carbondioxide
 Hydrocarbons
 Cadmium
 Ozone
 Hydrogen sulphide

16. INDICATORS OF AIR POLLUTION
 Smoke index
 % of sulphurdioxide in air
 Air pollution index
 Grit & dust measurement

17. MONITORING OF AIR POLLUTION
IN INDIA :-
- National air quality control programme

18. EFFECT OF AIR POLLUTION
- HEALTH ASPECT :
-Temporary effect
-permanent effect
-Social & economical effect

20. METHODS OF CONTROL & PREVENTION
 Containment
 Dilution
 Replacement
 Primary control
 Legal control
 International action

21. DISINFECTION OF AIR
-PHYSICAL METHHOD
 Control on dust
 Mechanical methods
 Use of UV rays
-CHEMICAL METHODS
 Chemical vapours
 Deodrants
 Burning of chemicals

22. THANK U