Fig. 1
From: Correlation networks of air particulate matter (\(\hbox {PM}_{2.5}\)): a comparative study
Data Description. a, c Probability density functions of \(\hbox {PM}_{2.5}\) concentrations across seasons. b, d Spatial distribution of average \(\hbox {PM}_{2.5}\) concentrations from Jan. 2014 to May 2020 respectively for China and California