Figure 2
From: A paradox for air pollution controlling in China revealed by “APEC Blue” and “Parade Blue”
Time series (A) and correlation (B,C) of daily averaged tropospheric NO2 VCDs measured by the MAX-DOAS and OMI satellite in Beijing urban region during the periods around APEC. The transparent blue square area represents the APEC period. And the red circle represents the two peak values during the APEC period.
