The chlorophyll contents of green bell peppers treated with 5 mg L-1 chlorine dioxide gas were higher than those of the control. However the chlorophyll contents of other samples were lower than those of the control (Fig.4). More rapid degradation of chlorophyll in the samples was observed with an increase in chlorine dioxide gas concentration, suggesting that the 10,20, and 50 mg L-' chlorine dioxide gas treatments resulted in reduction of chlorophyll content in green bell peppers.