The testimony contained comments from NIOSH regarding the regulatory hearing on formaldehyde (50000) exposure. NIOSH reviews have indicated that the use of a one sided statistical test appears to provide the greatest reassurance against missing an exposure related effect. While it has been agreed that coherent patterns in data are reassuring for developing public policy, the characteristics of the data influence the ability to deduce coherent patterns. Some of the studies on formaldehyde exposed individuals were very small in nature, included relatively brief times for the observation of latent diseases, and involved quite varied exposure scenarios. Comments were made on each of several submitted publications and concerned passive monitoring for formaldehyde, the type of production processes tested, post cure treatment, levels of control achieved at various companies, aspects of formaldehyde use at foundries, and excess incidence of lung cancer and squamous cell carcinomas in the nasal cavity.