Fill in the blanks spaces using the answers provided. HINT: pollutants, artificial, Micro organisms, pollutants, natural, discomfort, air conditioner.

a) Humidity causes
b) Free circulation of air reduces multiplication of clothing.
c) Chimneys and vents means of ventilating a room
d) is popularly used in large buildings as a ventilator.
e) Smoke, aerosol spray, dust and gases are referred to as