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The main objective of this study are:(1)to reveal the variation regularity of ozone concentration in urban forests with different habitat; and(2)to understand influencing factors of ozone variation.The ozone concentrations and meteorological factors at 1.5 m from the ground,generally considered to be the height of human respiration,in urban forests with three habitat as Foothill,River Valley and Ridge of Yuanshan Park in Shenzhen were monitored once every 2 hours in whole 24 h a day in summer.