It has been reported that daily maximum 8 h average (MDA8) O 3 presented an increasing trend at a rate of 5% per year in China during the warmer season in the most recent decade, faster than other regions in the world [ 5 , 6 ].
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It has been reported that daily maximum 8 h average (MDA8) O 3 presented an increasing trend at a rate of 5% per year in China during the warmer season in the most recent decade, faster than other regions in the world [ 5 , 6 ].