Section 36(b) in The Calcutta Improvement Act, 1911
(b)that danger to the health of the inhabitants of any area or of a neighbouring area is caused by -(i)the narrowness, closeness and bad arrangement and conditions of streets or buildings or groups of buildings in such area, or(ii)the want of light, air, ventilation or proper conveniences in such area, or(iii)any other sanitary defects in such area, or
