As a result of worsening wildfires driven by ClimateChange, a new study in ScienceAdvances finds simultaneous exposure to particulate and ozone pollution in the western U.S. has more than doubled in the past 2 decades.
). We test three SOM node configurations comprising 6 , 12 , and 20 nodes to identify a configuration that minimizes similarity between clusters while also capturing the range of patterns that occur in this region.
To help inform our SOM configuration selection, we examined two sets of spatial correlation coefficients following Gibson): between each SOM node pattern and the individual constituent patterns in that node and between every unique combination of node pairs . See fig. S7 for the distribution of both sets of correlation coefficients.
To isolate conditions antecedent to peaks in the spatial extent of widespread co-occurrence, we extract the largest co-occurrence spatial extent in nonoverlapping 15-day windows. This is done iteratively in descending order of co-occurrence extent for all July to September days during the period of overlap with burned area data .
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