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两次观察钒作业工人共34人，接触五氧化二钒（V2O5）烟6～7mg／m3组20入，工作3～4h后出现上呼吸道刺激症状10人，急性中毒7人；接触0．15～0．21mg／m3组14人，8h后出现呼吸道刺激症状7人，二个工作日后发生急性中毒3人。其中主要临床表现为咳嗽、咯痰、胸闷、气短，肺部可闻干性罗音．肺功能提示小气道功能异常。作者认为，接触V2O5烟时间加权平均浓度0.15mg／m3二个工作日即可发生急性中毒．
There were 34 vanadium working workers in total and 20 in 6 ~ 7 mg / m3 of vanadium pentoxide (V2O5) cigarettes. After 3 to 4 hours of operation, 10 people had upper respiratory irritation and 7 were acute poisoning. ~ 0.21mg / m3 group of 14 people, respiratory irritation symptoms after 8h 7 people, two acute poisoning occurred after 3 working days. The main clinical manifestations of cough, expectoration, chest tightness, shortness of breath, lungs can be heard dry rales. Pulmonary function suggests small airway dysfunction. The author believes that exposure to V2O5 smoke time-weighted average concentration of 0.15mg / m3 two working days can occur acute poisoning.