Respiratory Protection Program


For over 15 years, the Division of Environmental and Occupational Health Sciences at National Jewish Health has directed the Respiratory Protection Program. Our program is designed to protect workers from exposure to hazardous substances and help employers cost-effectively comply with federal regulations. Board-certified occupational medicine physicians, pulmonologists, certified industrial hygienists and trained respirator fit technicians provide comprehensive respiratory and hearing protection services including:

  • Medical clearance exams
  • Pulmonary function testing
  • Respiratory fit testing (quantitative and qualitative)
  • Audiometry
  • Industrial Hygiene Services
  • Worker training

Our professionally-staffed respirator fit test facility on the National Jewish Health campus is available during business hours or we can come to your facility. We specialize in providing comprehensive respiratory protection and audiometry services on-site at your facility to minimize employee scheduling conflicts and to optimize your organization's productivity. We understand your respiratory protection needs as we perform over 5,000 respirator fit tests per year in industrial, healthcare and construction work environments.

Learn about our Respiratory Protection Program Services

Learn about Occupational Safety and Health Administration (OSHA) Respiratory Protection Requirements

To schedule respirator fit testing, training, medical clearances, audiometry or industrial hygiene services please call 303.398.1539 or email Alison Welch at

Program Personnel

  • Christina Khat is a graduate of Colorado State University with a B.S. in Environmental Health with an emphasis in Chemistry. She received hands-on training and experience in administering Respiratory Protection standards, managing the storage and disposal of hazardous materials and waste, and environmental awareness training in asbestos, mold, hazardous materials, mercury, lead, and bloodborne pathogens. Christina has performed qualitative and quantitative fit testing services for the last two years at National Jewish Health and is knowledgeable regarding the intricacies of the fit of many different makes and models of respirators. She values health and well-being of people and has a genuine interest in protecting the health of the environment and public.
  • Annyce Mayer, MD, MSPH, is a board certified occupational medicine physician with special expertise in occupational lung disease. She has been actively involved in research and clinical practice for more than 10 years. She has consulting experience in industrial, governmental, and healthcare settings. She is also experienced in developing medical surveillance programs for complex exposures.
  • Alison Welch, MS is an industrial hygienist with 5 years of experience in monitoring and evaluating potential environmental and occupational hazards including airborne chemical exposures, indoor air quality, and physical hazards such as noise. She has performed enforcement and compliance for workplace regulatory standards such as the Respiratory Protection, Blood Borne Pathogens, and Personal Protective Equipment standards. She is particularly interested in exposure and risk assessment, indoor air quality, and developing training methods and tools to protect individuals from hazards in the home and at work.

Recommended websites for Additional Information