air & air pollution

AIR & AIR POLLUTIONSUDARSAN

INTRODUCTION•Air is essential for maintenance of life.

The immediate environment of man comprises of air on which depends all forms of life

Definition•Air is mixture of gases that forms

environment

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

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

organs

AIR OF OCCUPIED ROOM Chemical changes Physical changes

DISCOMFORT ZONE•It is subjective sensation which the people

experience in ill ventilated and crowded rooms

COMFORT ZONE•The range of effective temperature over

which majority of individuals feel comfortable

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+

PREDICTED FOUR HOUR SWEAT RATE (p4 sr)

Comfort zone 1-3 litres

Just tolerable 3-4.5 litres

intolerable 4.5+

AIR POLLUTIONDEFINITION: It is the condition when there

is excessive concentration of foreign matter in the outdoor atmosphere which is harmful to man or his environment

CAUSES OF AIR POLLUTION

Industrial sources Domestic sources Scientific research Transportation Other sources…

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

INDICATORS OF AIR POLLUTION

Smoke index % of sulphurdioxide in air Air pollution index Grit & dust measurement

MONITORING OF AIR POLLUTIONIN INDIA :- - National air quality control programme

EFFECT OF AIR POLLUTION- HEALTH ASPECT : -Temporary effect -permanent effect

-Social & economical effect

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

DISINFECTION OF AIR-PHYSICAL METHHOD Control on dust Mechanical methods Use of UV rays

-CHEMICAL METHODS Chemical vapours Deodrants Burning of chemicals

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