Exposure of employees to inhalation, ingestion, skin absorption, or contact with any material or
substance at a concentration above those specified in the "Threshold Limit Values of Airborne Contaminants for 1970" of the American Conference of
Governmental Industrial Hygienists, shall be avoided. See Appendix A to this section.
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.
Paragraphs (a) and (b) of this section do not apply to the exposure of employees to airborne asbestos,
tremolite, anthophyllite, or actinolite dust. Whenever any employee is exposed to airborne asbestos, tremolite, anthophyllite, or actinolite dust, the
requirements of 1910.1101 or 1926.58 of this title shall apply.
Paragraphs (a) and (b) of this section do not apply to the exposure of employees to formaldehyde.
Whenever any employee is exposed to formaldehyde, the requirements of 1910.1048 of this title shall apply.
[39 FR 22801, June 24, 1974, as amended at 51 FR 37007, Oct. 17, 1986; 52 FR 46312, Dec. 4, 1987; 58 FR 35089; June 30, 1993]