China is now suffering from both severe ozone (O₃) pollution and heat events. We highlight that North China Plain is the hot spot of the co-occurrences of extremes in O₃ and high temperatures in China. Such coupled extremes exhibit an increasing trend during 2014–2019 and will continue to increase until the middle of this century. And the coupled extremes impose more severe health impacts to human than O₃ pollution occurring alone because of elevated O₃ levels and temperatures.