Abstract
One hundred years ago last month, Allied forces stood their ground in Ypres, preventing the larger and better-equipped German army from taking control of that strategic town in western Belgium. The following spring, Germany attacked again in the Second Battle of Ypres, gassing thousands of French colonial troops with chlorine. That infamous event, which marked the first major use of poison gas as a weapon, introduced the world to the devastating effects of modern chemical warfare. The attack also sent scientists and manufacturers scrambling to develop protective gas masks. A century later, scientists and engineers continue to improve gas masks and gas mask filters. They are drawing on advances in materials and engineering to design masks that are more effective and functional than ever before. And to ensure that the overall gas mask package provides the highest level of respiratory protection, they are studying new types of filtration media, particularly ...
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