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Potential Impacts of CF3I on Ozone as a Replacement for CF3Br in Aircraft Applications



Yue Li, Donald J. Wuebbles


CF3I has been considered to be a candidate replacement of CF3Br used in aircraft for fuel inerting and for fire fighting. In this study, the chemical effects of aircraft released CF3I on atmospheric ozone were examined with the current UIUC 2D Chemical Transport Model (CTM). Using the former estimate of aircraft emission profile for tank inerting in military aircraft as used in (1), the resulting equivalent ODPs for CF3I were in the range of 0.07 to 0.25, above the critical value 0.05, the U.S. EPA for policy consideration. As a sensitivity analysis, we analyzed a case with emissions associated with inerting occurring at lower altitudes. This case resulted in much lower ODPs. Finally, we analyzed the potential effects on ozone resulting from using CF3I in fire fighting connected with engine nacelle and auxiliary power unit applications. The resulting effects on ozone showed extremely low ODPs ≤ 0.05. The altitudes where most of aircraft released CF3I occurs seemed to be a dominant factor in its ozone depletion effects.
Special Publication (NIST SP) - 984-4
Report Number


Li, Y. and Wuebbles, D. (2005), Potential Impacts of CF3I on Ozone as a Replacement for CF3Br in Aircraft Applications, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed April 15, 2024)
Created January 1, 2005, Updated February 19, 2017