Required Respirator

<0.2 µg Be/m3

None

<2.0 µg Be/m3 (<10 x AL)

Half-mask, negative-pressure respirator with P100 filter

<10 µg Be/m3 (<50 x AL)

Full-face, negative-pressure respirator with P100 filter or half-mask PAPRb with P100 filter

<20 µg Be/m3 (<100 x AL)

Full-face PAPR with P100 filter

<200 µg Be/m3 (<1000 x AL)

Supplied-air, full-face respirator operated in pressure demand mode

>200 µg Be/m3, unknown concentration, or firefighting

Full-face SCBA in positive pressure mode

a "Exposure" means measured exposure or potential for exposure at the indicated level.

b Powered, air-purifying respirator.