A worker sweeps up settled <a href="//commons.wikimedia.org/wiki/Air_pollution" title="Air pollution">particulates</a>.  He is sweeping an area blocked off to cars and very rarely used by people, so the dirt is assumed to have arrived from the air.<br><br>The specific location is the ground floor of the parking deck serving Publix, Target, and other stores in the Buckhead region of Atlanta, GA, USA.
<a href="//commons.wikimedia.org/wiki/User:SCEhardt" title="User:SCEhardt">Scott Ehardt</a>
2005-02-18
<span class="int-own-work" lang="en">Own work</span>