In accordance with paragraph 4(1)(a), the health effects shall be assessed by the conventional method described below using concentration limits.

Where the substances concerned are dangerous for supply and are listed as dangerous for supply in the approved supply list and are assigned concentration limits necessary for the application of the method of assessment described below, these concentration limits shall be used.

Where the substances concerned are dangerous for supply and do not appear in the approved list as dangerous for supply or appear there without the concentration limits necessary for the application of the method of evaluation described below, the concentration limits shall be assigned in accordance with Part II of this Schedule.

In its application to preparations that are gases, this Part shall be modified so that references to concentrations expressed as percentage by weight are to concentrations expressed as the same percentage by volume.

Where a preparation contains at least one substance which, in accordance with the Notification of New Substances Regulations 198258 bears the warning “Caution — Substance not yet fully tested”, the label of the preparation must bear the label “Caution—This preparation contains a substance not yet fully tested” if the substance is present in a concentration equal to orin excess of 1% by weight.

A substance referred to in sub-paragraph (4) above must be treated on the same basis as the other substances present in the preparation when applying the method of evaluation by calculation, if the labelling gave at least an indication of the health effect.