http://www.stonelions.com/Jacksonville.htm
An Isopleths map is a map that features lines that connect to each other that represent some type of geographical occurance. For example, isobars on a weather map. According to Stone Lions Environmental Co, This map below is "depicting the extent of the five-year average total toxic chemical 100 microgram per cubic meter isopleth line in Jacksonville." I believe the red line indicates the areas of toxic chemical emissions throughout the time period.
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