Gas masks have apparently become a hot commodity near Ferguson, Mo., after more than a week of clashes between police and protesters since an officer’s fatal shooting of an unarmed black man.

Israel has a shortage of civilian gas masks, but you wouldn’t know it from walking down Manhattan’s St. Mark’s Place, where the masks are on sale in half a dozen stores for a mere $25 each. The ...

An emergency gas mask that can be made at home was demonstrated in Manhattan last week by the American Women’s Voluntary Services. The necessary materials can be found in almost any house: a bathing ...