Fig. 6: GIS case study in Montgomery County, Pennsylvania.

Map of Montgomery County, Pennsylvania (bold black line) showing mean UCMR3 PFOA measurements at the zip code level (purple and gray shading), median household income per zip code from 2010 U.S. Census where blue slashes indicate higher income and orange slashes indicate lower income, PFAS-related industry facilities (black dots), airports (red planes), and military sites (red squares).