Questions and Answers on Israel's Use of White Phosphorus in Gaza and Lebanon
When airburst, white phosphorus covers a larger area than when groundburst and is useful to mask large troop movements. In so doing, however, it spreads the incendiary effects over a wider area, and in densely populated areas like Gaza it increases the risks to civilians. When the weapon is groundburst, the danger zone is more concentrated, and the smokescreen remains for longer. The cloud from white phosphorus is dependent on atmospheric conditions, so it is not possible to generalize how long