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<p>on individual <a href="page.php?w=organism">organism</a>s and on the structure of <a href="page.php?w=ecosystem">ecosystem</a>s as a whole. </p>

<p><big>Zones of influence</big></p>
<p>Pollutants can also be defined by their zones of influence, both horizontally and vertically.</p>

<p><big>Horizontal zone</big></p>
<p>The horizontal zone refers to the area that is damaged by a pollutant. Local pollutants cause damage near the emission source. Regional pollutants cause damage further from the emission source.</p>

<p><big>Vertical zone</big></p>
<p>The vertical zone refers</p><p>
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