1: Hazardous substance risk assessment The occupational hygienist (OH) has made some initial measurements of dust levels and gathered other information relating to exposure of workers to vitamin C powder. All of this information is provided in supporting document 1. (a) Explain what the OH should have considered when planning to measure workers' personal dust exposure levels. (15) Note: You should support your answer, where applicable, using relevant information from the scenario and the relevant supporting document. (b) Looking at the information in section 1 of supporting document 1 (i) give reasons why the OH decided to take these fixed place (static) measurements of dust levels. (11) Note: You should support your answer, where applicable, using relevant information from the scenario and the relevant supporting document. (ii) comment on the limitations of this information when assessing the risks to workers exposed to vitamin C powder. (iii) comment on what the numerical information indicates. (c) Consider how the information in section 2 of supporting document 1 could be used when assessing the risks of workers' exposure to vitamin C powder. (d) Based on all available information in the scenario and supporting documents, what are the considerations when carrying out a hazardous substance risk assessment for the handling of vitamin C powder by workers at Nutripex? Note: You do not need to consider again the specific detail regarding dust exposure information referred to in your answers to parts b (iii) and c