to take the trouble to get the appearance of the ozone gas rubber later found that the rubber of the control unit and the ozone concentration at 200 ppb are identical. (Figure A 3 and 3 B), while the rubber is 600 ppb ozone concentrations.(3 Figure C) and found the dark red in the beginning of the ozone gas concentration 900 - 1500 ppb ozone gas, the concentration is 900 ppb found red bar is located at the tip of the leaf (3 Figure D) received 1200 and 1500 ppb concentration ozone gas(Figure E 3 and 3 F) by the appearance of damage found to be observed. Later, ozone gas is for 2 days
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