Image 1 of 1
mpiRW_0509_AirFlow_1.JPG
NEW YORK, NY - MAY 9: Air Sampler pictured as the Chemical and Biological Defense Division of the U.S. Department of Homeland Security study how air moves through subway tunnels and how a biological contaminant would travel during a terrorist attack in New York City on May 9, 2016. Credit: RW/MediaPunch
AIr Sampler