Map<br />
           <img src="http://environment.yale.edu/galleries/uploads/10spring-location.jpg" width="691" height="459" alt="Map" style="margin: 4px 0;" ><br />
<p>The cost, per ton, of the damage to human health caused by the ground-level emission of sulfur dioxide (SO2).
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<div class="credit"><em>Credit:</em> Robert Mendelsohn</div>