### Temporal and spatial distribution of ozone, meteorological effect and relation with its precursors in Guiyang city

SU Zhihua1,2, HAN Huiqing3*, LI Li1,2, LIU Jing1,2, PENG Jiaoting1,2

1. 1. Institute of Geographic Environment and Earth Resources, Guizhou University of Finance and Economics, Guiyang 5500025, China；
2. The School of Management Science, Guizhou University of Finance and Economics, Guiyang 5500025, China；
3.College of Architecture and Urban Planning,Guizhou Institute of Technology,Guiyang 550003,China
• Received:2020-02-21 Online:2020-07-22 Published:2020-07-22

Abstract: Based on the continuous monitoring data of O3 and its precursors NO2 and CO from 10 air monitoring stations and meteorological observation data in the urban area of Guiyang during a natural year from March 1st, 2015 to February 29th, 2016, temporal and spatial distribution characteristics of O3, meteorological effects and the relationship with its precursors were studied in Guiyang city. The results showed that the diurnal variation of O3 showed a "single peak" distribution characteristic, which generally reaching its peak around 16：00 - 17：00. From March to October and in February of the next year, the monthly average O3 concentration was relatively high, while in November, December and January of the next year, the O3 concentration was relatively low. O3-8h-max concentration was positively correlated with sunshine hours, daily maximum temperature and wind speed, and negatively correlated with air pressure and average relative humidity. The O3 concentration was relatively low in the urban area and relatively high in the suburbs, and the pollution gradually increased from the downtown to the suburbs. The diurnal variation of atmospheric oxidizer OX was characterized by "single peak" distribution, with the strongest oxidization in spring and summer. OX was controlled by different factors during the day and night. OX was mainly controlled by O3 during the day and NO2 during the night,respectively.

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