Inadequate ventilation has following effects on the occupants of the room:-

(a) Lack of oxygen leads to early fatigue. It reduces alertness and working capacity of a person. The behavior changes, person becomes frustrated, rough and loses interest in his work.

(b) Inadequate Ventilation increases the temperature resulting in sweating, heat exhaustion, and faintness.

(c) Foul odour from skin, mouth, stomach and clothes spreads in the environment which produces uneasiness, sickness etc.

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(d) Living for a longer duration in inadequately ventilated en­vironment leads to digestive disorder, loss of appetite, anaemia, me­tabolic disturbances, etc.

(e) Cold, cough, infectious diseases, influenza, pneumonia etc. are some of the problems of inadequate ventilation.

(f) Some of the gases are injurious to health, which are generally released from exhaust of vehicles and industries. Inhalation of these gases damages the eyes and trachea. It also causes respiratory diseases.