Ozone intrusion from stratosphere into troposphere and its effects on the tropospheric oxidants budget in East Asia were investigated. Intense ozone intrusion was found to occur in southwest China and northwest Pacific rims near Japan and northeast China, which contributed to the highest ozone concentration in the world. While, in the lowest troposphere photochemical oxidant formation from anthropogenic pollutants was active and created regional-scale high-concentration ozone in the atmospheric boundary layer. Transboundary photochemical oxidants pollution in eastern China, Korea and Japan was caused by the long range transport of this regional-scale hgih concentration ozone.
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