Fig. 1: Network conceptualization.
From: Dynamics of PM2.5 and network activity during extreme pollution events
a Number of monitoring stations exceeding the EPA's yearly PM2.5 standard (12 μg/m3) by the U.S. climate regions. b Distances (in km) between adjacent monitoring stations within each climate region. c Spatial distribution of FRM/FEM sensors (blue circles) across the climate regions53. d–g Conceptualization of spatial correlation networks responses to extreme pollution events. d Illustration of an urban area in normal conditions. e Urban area during a wildfire, displaying deteriorated air quality. Under typical conditions, the network shows localized correlations (f), while during extreme pollution, regional correlations emerge (g), with the network’s complexity measured by the total degree (2L).
