![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEFUd-Qw47rvhyphenhyphenHrjmHP2m8AYdthyphenhyphen0YUJlXb2bCIBQA2G3e8a0PtMbprmhYEr7eCrG00jFV1JspokwsKFcpdAKPz5xnVUCSuiC4QSv7lgoHR8tGj7vg4H7j0TnxtZY8qx4JoxeJV4aloS4/s400/isopleth+map.gif)
This isopleth map shows the hydrogen ion concentration as PH in 1999. The variation in the color scale of the lab PH levels shows higher concentration of PH levels on the east coast in opposed to the rest of the continental United States where it is about at equal level throughout.
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