The Pentagon is scheduled to release an odorless, invisible, and yes, harmless, gases into the city Thursday to test how quickly they spread through buildings, officials said.
The test is part of the military's national security preparation for the capital area.
Over the past few years, the defense agency has worked with Arlington County to set up chemical sensors throughout the county, where thousands of defense employees work in leased office space...
...The test, dubbed "Urban Shield: Crystal City Urban Transport Study," is similar to one conducted in Manhattan a few years ago, officials said.
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