Abstract: Using GF-5/EMI tropospheric NO2 columns product developed by University of Science and Technology of China, combined with the emission inventory, surface precipitation and temperature data, the spatio-temporal variations of tropospheric NO2 that is in the North China Plain (NCP) from January to August 2019 are studied. The results show that NO2 pollution is concentrated in Henan, Hebei and Tianjin, especially in Jiaozuo, Henan (1.670×1016 molecules·cm−2) and Shijiazhuang, Hebei (1.426×1016 molecules·cm−2). The weekly changes generally show “reverse-weekend effect”, but the trend in some agricultural cities is opposite. The monthly change decreases continuously from January (1.635×1016 molecules·cm−2) to the lowest level in August (1.839×1015 molecules·cm−2). The correlation coefficient with monthly precipitation and temperature are −0.8622 (p = 0.0059 < 0.01) and −0.9162 (p = 0.0014 < 0.01), respectively, and with anthropogenic monthly emissions is 0.9778 (p = 2.69×10−5 < 0.01). The industrial cities in NCP, represented by Tianjin, are seriously polluted, which need to be paid more attention to on the prevention and control of air pollution in the future.

Key words: troposphere, GF-5, the North China Plain, NO2 pollution