found: Work cat.: Booth, Harold Simmons. Boron trifluoride and its derivatives, 1949:p. 16 (Boron trifluoride is a colorless gas which does not support combustion and which hydrolyzes in ordinary air, producing a copius white smoke. The hydrolytic products have a sharp acidic odor)
found: NIOSH Pocket Guide to Chemical Hazards, via WWW, Nov. 16, 2007(Boron trifluoride, synonyms: Boron fluoride, Trifluoroborane, physical description: Colorless gas with a pungent, suffocating odor ... Forms dense white fumes in moist air. Shipped as a nonliquefied compressed gas)
found: Britannica online, Feb. 28, 2008:under boron (boron reacts with halogen elements to give trihalides (BX₃, where X is F, Cl, Br, or I), so-called Lewis acids)