Section 22(1)(b) in The Punjab Town Improvement Act, 1922
(b)danger is caused or likely to be caused to the health of the inhabitants of such local area or part thereof by reason of -(i)the congested condition of streets or buildings or groups of buildings in such local area or part, or(ii)the want of light, air, ventilation or proper conveniences in such local area, or part, or(iii)any other sanitary defects in such local area or part,