(e)"Work location" means a location in a factory at which a worker works or may be required to work at any time during any shift on any day.(ii)Limits of concentrations of substances at work locations. - The time weighted average concentration of any substance listed in Table 1 or 2 of the clause, at any work vacation in a factory during any shift on any day shall not exceed the limit of the permissible time weighted average concentration specified in respect of that substance.(iii)In the case of substance mentioned in Table 1 in respect of which a limit in form of short term maximum concentration is indicated, the concentration of such a substance may exceed the permissible limit of the time weighted average concentration for the substance for short periods not exceeding 15 minutes at time, subject to the condition that-
