Table 3 Five factors and their scores for probability parameter in CB Nanotool (retrieved from²³).

Estimated amount of NM used during operation

\(>100 \; {\text{mg}}:25\)

11–100 mg: 12.5

0–10 mg: 6.25

Unknown: 18.75

Dustiness/mistiness

\(>\) 15: 15

11–15: 10

6–10: 5

Unknown: 11.25

Number of employees with similar exposure

 > 15: 15

11–15: 10

6–10:5

Unknown:11.25

Frequency of operation

Daily: 15

Weekly: 10

Monthly: 5

Less than monthly: 0

Unknown:11.25

Duration of operation

 > 4 h: 15

1–4 h: 10

30–60 min: 5

 < 30 min: 0

Unknown: 11.25