开封市花生机收期空气质量的时间变化特征及其影响因素分析

Time Variation Characteristics and Influencing Factors Analysis of Air Quality during Peanut Harvest Period in Kaifeng City

AQI、PM_(10)和PM_(2.5)浓度年均值变化趋势一致,日变化“两峰一谷”特征明显,而最大值、最小值和平均值呈现逐年减小趋势。污染物传输以北方的轨迹为主,以长距离输送为主,省内短距离输送为主导,PM_(10)潜在源区主要分布在河南中部和河南与山东交界处,以其为中心向外扩张;污染物潜在源区的贡献值>70的高值区主要分布在周边省市。

The annual average variation trends of AQI,PM_(10),and PM_(2.5) concentrations are consistent,with a clear“two peaks and one valley”characteristic of daily variation,while the maximum,minimum,and average values show a decreasing trend year by year.The transfer of pollutants was mainly based on the trajectory in the north,with long-distance transportation being the main focus and short distance transportation within the province being the main focus.The potential source areas of PM_(10) were mainly distributed in the central part of Henan and the border between Henan and Shandong,with it as the center and expanding outward;The high value areas with a contribution value greater than 70 in the potential source areas of pollutants were mainly distributed in surrounding provinces and cities.