LOOKING BACK ON 9/11 REFLECTIONS ON THE 20TH ANNIVERSARY OF SEPTEMBER 11, 2001 The attacks on the World Trade Center initiated the demolition of the buildings and ignited the largest industrial fire in North America. Nearby buildings sustained structural damage and a debris cloud containing harmful substances enveloped Lower Manhattan. Twenty years later, the impact of the attacks and lessons learned from the cleanup are still significant. BY BERNARD L. FONTAINE, JAMES DETWEILER, JOHN R. KOMINSKY, AND FRANK EHRENFELD III

FROM THE ARCHIVES: EXPOSURES AT THE WORLD TRADE CENTER TEN YEARS LATER, WHAT HAVE WE LEARNED? From the September 2011 issue of The Synergist: "Ten years ago this month, the collapse of the World Trade Center towers and subsequent recovery efforts released huge quantities of particulate matter, combustion products, gases, vapors, and other contaminants into the environment. Unfortunately, the industrial hygiene community was largely unprepared for the health and safety challenges, which included monitoring and protecting first responders from respiratory and other hazards and extended into the process of reclaiming surrounding buildings." BY JACK SPRINGSTON