http://dwb4.unl.edu/Chem/CHEM869V/CHEM869VLinks/weather.about.com/newsissues/weather/library/weekly/aa071600a.htm
The map above displays hydrogen concentration as pH measurements made at field labs in 1998. The rainfall is collected and measured in terms of pH to determine the general effects of acid rain, along with SO4 and NO3 concentrations. With distribution across the U.S, it qualifies as an isopleth map due to it simplifying information about a region.
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