| pi | is the total personal protective equipment (PPE) factor, reflecting the type and usage of all types of PPE used during an exposure event i (range from 1 to 0.1) |
| pi, q | is the personal protective equipment (PPE) factor, reflecting the type and usage of a specific PPE type q used during the exposure event i |
| q = 1, … n | is an index for different types of PPE |
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