&gt; atmospheric lead from gasoline additives was a major source of lead<p>There&#x27;s such a direct correlation with leaded gas and violent crime in USA. That it was likely a large if not the largest factor in the rise and fall of crime rates.<p><a href="http:&#x2F;&#x2F;www.forbes.com&#x2F;sites&#x2F;alexknapp&#x2F;2013&#x2F;01&#x2F;03&#x2F;how-lead-caused-americas-violent-crime-epidemic&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.forbes.com&#x2F;sites&#x2F;alexknapp&#x2F;2013&#x2F;01&#x2F;03&#x2F;how-lead-ca...</a>