Table 1. Breakdown of the sampled RPE models for the follow-up survey.
| Dust musk | Gas musk | PAPR | |
|---|---|---|---|
| 2018 | 35 | 35 | 14 |
| 2017 | 35 | 35 | 14 |
| 2016 | 30 | 30 | 14 |
| 2015 | 30 | 30 | 10 |
| 2014 | 30 | 25 | 10 |
RPE: respiratory protective equipment; PAPR: powered air-purifying respirators.
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