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Environment & Health

Question
28 out of 72
 

All are indicators of air pollution except:



A Soiling index
B Mcardle’s index

C SPM
D SO2 concentration

Ans. B Mcardle’s index Ref: Textbook of PSM Park; 22nd edi, pg –694

a. McARDLE'S MAXIMUM ALLOWABLE SWEAT RATE: This is also an index of thermal comfort.

b. McArdle and associates took 4.5 litres of sweat excreted in four hours as the maximum allowable sweat rate 'compatible with physiological normal reaction of acclimatized, healthy young men for repeated exposures to heat. They prepared a chart from which the "predicted four-hour sweat rate" (P4SR) can be obtained from any combination of dry and wet bulb temperature of the air, mean radiant air temperature and air velocity, under different work intensity. McArdle has put P4SR value of 3 as upper limit of comfort zone.

c. The other options are all indicators of Air Pollution. Some important facts about these indicators:

d. The best indicators of air pollution are sulphur dioxide, smoke and suspended particles. These are monitored on a daily basis over several sites. The results are then collected by a central agency.

A. Sulphur dioxide: This gas is a major contaminant in many urban and industrial areas. Its concentration is estimated in all air pollution surveys.

B. Smoke or Soiling index: A known volume of air is filtered through a white filter paper under specified conditions and the stain is measured by photoelectric meter. Smoke concentration is estimated and expressed as micrograms/cubic metre of air as an average level over a period of time.

C. Grit and dust measurement: Deposit gauges collect grit, dust and other solids. There are analysed monthly.

D. Coefficient of haze: A factor used, particularly in the USA in assessing the amount of smoke or other aerosol in air.

E. Air pollution index: It is an arbitrary index which takes into account one or more pollutants as a measure of the severity of pollution. For example, the following index has been used in USA: 10 times the sulphur dioxide concentration plus twice the carbon monoxide concentration (both in ppm by volume) plus twice the coefficient of haze. It was considered to be a cause for alarm when the value of this index rose from its value of about 12-50 or more.

Environment & Health Flashcard List

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