On 22 April 1915, less than nine months into the First World War ... an estimated one million. As gas masks were distributed, which largely negated the effects of chlorine, the chemicals used ...

You can call Poison Control at 1-800-222-1222 ... So just how dangerous is chlorine gas? It was effectively used as a weapon during World War I. Symptoms of exposure are: Ammonia, which is ...

Canadian soldiers were among the first to witness the horrors of modern warfare as "the war to end all wars" exploded onto the world stage ... cloud - poisonous chlorine gas - rose from the ...