Abstract: As an important trace gas in the atmosphere, ozone is one of the important components that affect the movement of the atmosphere in the troposphere and stratosphere. The high-precision detection of ozone is of great significance to the environment and climate, and OMI sensor is currently one of the main remote sensing sensors capable of detecting global ozone levels. In this paper, the accuracy of OMI satellite data products is verified by using the data of 44 ozone observation stations around the world of the ground-based Pandora observation network. The results show that there is a good linear correlation between OMI ozone products and Pandora ground measurement results, with the correlation coefficient reaching 0.946. However, there are regional differences in the accuracy results. In the southern hemisphere, the correlation coefficient is 0.894. While in the northern hemisphere low latitudes, the correlation coefficient is 0.931, in the middle latitudes, the correlation coefficient is 0.951, and in the high latitudes, the correlation coefficient reaches 0.957. In addition, the verification accuracy is also related to the total ozone column. When the total ozone column is less than 220 Du (corresponding to the ozone hole condition), OMI satellite product is overestimated by about 13%. Above 400 Du, OMI′s ozone product is lower than Pandora′s ground-based measurement. And as the total ozone column increases, the underestimation becomes more serious. When the total ozone column reaches 500 Du, OMI′s ozone product is underestimated by about 4%.

Key words: ground-based verification, ozone distribution, relative error, Pandora sun photometer