[Characteristic of Surface Ozone and Meteorological Parameters Analysis in Anyang City].

This study uses the national ambient air quality station data of Anyang City from 2014 to 2017 to analyze the characteristics and variation rules of ozone (O) in different functional zones (urban, suburban, and industrial), and also studies meteorological influencing factors and potential source distributions of O pollution. The results showed that the O concentration in Anyang increased significantly between 2014 and 2017, whereby pollution started to advance from 2015 and the earliest occurrence of an O pollution episode was in April 2017. The 90 percentile and average concentrations of O in the industrial zone increased at faster rates (average annual growth of 16.0 μg·m and 13.0 μg·m, respectively) than of those in the urban and suburban zones. The O concentrations at the suburban site showed the fastest increase of all zones at the 5 percentile (average annual growth of 13.2 μg·m). The monthly variation in O concentrations in Anyang showed an "M" pattern that varied spatially depending on the zone. Temperature played a leading role in O concentrations; air temperatures >23℃, relative humidity <58%, and a wind speed of 5 m·s in a south-southwesterly direction were closely related to the occurrence of high O concentrations. Potential sources of O in different seasons were significantly different, and mainly distributed in southern Hebei, northern Hubei, and northern Shenyang in summer. The first heavy O pollution day in the studied period was in May 2017, at which time the highest O concentration was found in the industrial zone (up to 405 μg·m). This heavy O pollution episode was related to the continuous high temperature that was caused by the transfer of a dry, hot air mass in western China.