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 O_X was characterized by "single peak" distribution, with the strongest oxidization in spring and summer. O_X was controlled by different factors during the day and night. O_X was mainly controlled by O₃ during the day and NO₂ during the night,respectively.

Key words:

Guiyang, ozone (O3), meteorological effects, precursors, atmospheric oxidants (OX)