Section 168(b) in U.P. Building And Other Construction Workers (Regulation Of Employment And Conditions Of Service) Rules, 2009
(b)when dry ingredients of concrete are being mixed in confined spaces such as silos :(i)the dust shall be exhausted at the time of such mixing; and(ii)in case the dust cannot be exhausted, as specified in sub clause (i), the building workers shall wear respirators at the time of such mixing.
