1. U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2018-176. A guide to air-purifying respirators. Available from: https://doi.org/10.26616/NIOSHPUB2018176. Accessed February 5, 2019.
2. Occupational Safety and Health Administration. Occupational safety and health standards: personal protective equipment: respiratory protection: 1910.134(d)(3)(i)(A).https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_id=12716&p_table=STANDARDS. Accessed February 5, 2019.
3. Occupational Safety and Health Administration. OSHA technical manual, section III: chapter 4, heat stress. Heat-related illness prevention program. Available from:https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_4.html#acclimatization. Accessed February 5, 2019.
4. The National Institute for Occupational Safety and Health. Eye safety: infection control. Available from:https://www.cdc.gov/niosh/topics/eye/eye-infectious.html. Accessed February 5, 2019.
5. The National Personal Protective Technology Laboratory. Respirator trusted-source information. Section 3: ancillary respirator information. Available from: https://www.cdc.gov/niosh/npptl/topics/respirators/disp_part/respsource3healthcare.html. Accessed April 9, 2019.