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This study was conducted to compare ozone sensitivity among Betula sp. by measuring visible foliarinjuries and growth responses. Four Betula sp.(B. costata, B. davurica, B. platyphylla var. japonica andB. ermani) grown in the greenhouse, were transplanted in the plastic pots. One-year-old seedlings offour Betula sp. exposed to relatively high ozone concentration(100 pb) for 8 h day-1 for 5 weks infumigation chamber. We measured visible injuries, leaf numbers and leaf areas at the end ofexperiments, and growth effects were evaluated by measuring the relative growth rate(RGR) of heightand diameter and the dry weights of leaf, stem and root once a week. Four Betula species showed thesignificant differences for growth responses by the ozone treatment. Growths of three species, exceptfor B. ermani, were significantly reduced by the O3 exposure. B. costata with leaf senescence at theearly growing stage and B. davurica indicated highest visible foliar injury rate may be the sensitivespecies at the 100 ppb ozone concentration. Although the growth rate of B. ermani was reduced by100 pb ozone exposure at the early growing stage, B. ermani may be a tolerance species that recoverthe growth rate with the adaptation for the high ozone concentration.