Fig. 1: Comparison between observations and CAMSRA for NO2 across China.
From: Disentangling drivers of air pollutant and health risk changes during the COVID-19 lockdown in China
a–e show comparison results of the daily averaged NO2 from observations and CAMSRA during the equivalent time of the 2020 COVID-lockdown from 2015 to 2019. f shows the comparison result in 2020 and additionally the corresponding data for the time average over 2015 to 2019 (blue line) and 2018 to 2020 (green line). The solid purple circle represents the average daily NO2 concentration of CAMSRA, the black circle represents the average daily NO2 concentration of observation across China, respectively. The red dash line represents the Chinese New Year’s day (CNY). Different background colors represent different time periods including “Before CNY” (gray shaded area) ranged from days −21 to −8 from the CNY’s day, “CNY” (red shaded area) ranged from days −7 to +10 from the CNY’s day, “Extended COVID-lockdown” (moss shade area) ranged from days +11 to +42 from the CNY’s day, and “Total COVID-lockdown” ranges from days −1 to +42 from the CNY’s day. The gap between the two black arrow lines represents the China’s Clean Air Plan effect (CAP).
