&gt; By that definition, anything outside of one&#x27;s immediate focus and interests is &quot;cognitive pollution.&quot;<p>If also has to bring you no value as it acts to distract you.<p>&gt; As forms of advertising go, I can&#x27;t think of many which are less disruptive, or easier to simply ignore, than billboards.<p>Each billboard is less disruptive, but a hundred can cry for your attention at once.