Figure 6
From: A paradox for air pollution controlling in China revealed by “APEC Blue” and “Parade Blue”
The variations of averaged Ratio and mean tropospheric NO2, O3 and HCHO VCDs of three periods during Parade (A) and during APEC (B) at Beijing urban site (40°N, 116°22′48″E)within 1° × 1° mean value. The USTC’s OMI tropospheric NO2 products, USTC’s recalibrated OMI HCHO products and OMI tropospheric O3 products were used here.
