Based on hourly meteorological and environmental monitoring data in Cangzhou of Hebei Province from 2014 to 2020, this paper analyzed the aggravation of ozone (O3) pollution and its relationship with meteorological factors. The results are as follows: (1) The pollution of O3 in Cangzhou had been increasing and O3 had become the primary pollutant. The pollution of O3 concentrated from May to September, and the diurnal variation of O3 mass concentration showed single peak and single valley type, and the maximum concentration occurred around 16:00 BST. (2) During the period of O3-8 h maximum value from May to September, the average temperature, maximum temperature, relative humidity and total radiation irradiance were strongly correlated with the O3 mass concentration, while the correlation between station atmospheric pressure, water vapor pressure, mean wind speed and the O3 mass concentration didn’t pass the significance test. (3) During the period of O3-8 h maximum value from May to September, when the average temperature of 8 h was above 30.9 ℃, the maximum temperature of 8 h was above 32.7 ℃, the average relative humidity of 8 h was below 42.1% and the average total radiation irradiance of 8 h was above 505.8 W·m-2, the probability pollution of O3 was up to 84%. (4) Meteorological factors were not sufficient conditions for rapid increase of O3 hourly mass concentration.
