Dr. McKay provides a comprehensive step-by-step guide for conducting qualitative respirator fit testing using Saccharin (sweet) or Bitrex (bitter) fit testing agents. Dr. McKay has 40 years of national and international experience in respiratory protection as a faculty member at the University of Cincinnati. Dr. McKay is active in all areas of respiratory protection including research, teaching, and clinical practice. Dr. McKay is the past chair of ANSI/AIHA Z88.10, the committee responsible for publishing guidelines for “Respirator Fit Test Methods” and a member of ANSI/ASSE Z88.2-2015 guideline responsible for publishing the “American National Standard Practices for Respiratory Protection. Respirator committee assignments include the American Industrial Hygiene Association's Respiratory Protection committee. To keep current with respirator wearer issues and concerns, he personally conducts respirator fit testing and a variety of worker training programs. He’s developed more than a dozen different continuing education courses on respiratory protection, which include fit testing, respirator selection, cartridge change out, program administration, and other topics.