Posterior anthropogenic emissions of CO and NOx in China before and within the COVID-19 lockdown period in 2020

This dataset provides the temporal averages of posterior anthropogenic emissions of CO and NOx in China as the COVID-19 period in 2020 obtained through the data assimilation that incorporated surface air quality measurements. There are two data files, which are CO.before_within_lockdown &amp; NOx.before_within_lockdown. Each file has two time frames, corresponding to the period before the lockdown (Jan 1-20, 2020) and within the lockdown period (Jan 21 - Feb 9, 2020). This dataset was originally created by Kong et al. (2023, ACP). Please check the reference for more details.Reference:<br>Kong et al. (2023). Unbalanced emission reductions of different species and sectors in China during COVID-19 lockdown derived by multi-species surface observation assimilation, Atmospheric Chemistry and Physics, 23, 6217–6240, https://doi.org/10.5194/acp-23-6217-2023