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Recently, the tropospheric ozone has gained a global attention for its adverse effect on vegetation as well as itscontribution to the global warming. Although a number of studies have been carried out for the urban ozone, theeffect of ozone on vegetation is still largely unknown in Korea. The present work aimed at performing the rstevaluation of forest damage by ozone using the national air monitoring data from the year 2000 to the year 2005.Moreover, it also explored the relevance of adverse effect of ozone to the recent events on leaf chlorosis of blacklocust, Robinia pseudo-acacia, leading to early foliage widely observed in Korea since 2001.In the nineties, forest damages caused by ozone such as leaf chlorosis occurred in Europe and North Americaand led to invoke comprehensive field and laboratory studies. As a result, AOT40, implying the accumulated doseover a threshold 40 ppb, was developed to assess the forest damage by ozone. 19 air monitoring stations wereselected across Korea to calculate AOT40 from the year 2000 to the year 2005. The calculated AOT40 generallyincreased during April and May and reached the maximum after May. The increase of AOT40 diminishedsubstantially from the mid-June as the rainy season started. The calculated AOT40 in the nine rural sites from the year 2002 to the year 2005 ranged from 6.8 to 29.4 ppm-hr. And all the AOT40 at the year 2005 exceeded the critical value of 10 ppm-hr for forest damage. Morevoer thecalculated AOT40 of Korea appeared higher than the AOT40 of Europe in the year 2004/2005 and comparable tothe AOT40 of China in the year 2000. Despite the high levels of the calculated AOT40 since the year 2001 and theconsistency of time of seasons between high AOT40 values and occurrence of chlorosis of black locust, furtherstudies are required to conclude that the chlorosis of black locust occurred from the year 2001 to the year 2005were resulted from a damage by ozone.