1926.55(b)
To achieve compliance with paragraph (a) of this section, administrative
or engineering controls must first be implemented whenever feasible.
When such controls are not feasible to achieve full compliance,
protective equipment or other protective measures shall be used to keep
the exposure of employees to air contaminants within the limits
prescribed in this section. Any equipment and technical measures used
for this purpose must first be approved for each particular use by a
competent industrial hygienist or other technically qualified person.
Whenever respirators are used, their use shall comply with 1926.103.
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