Modern doctrine requires very high concentrations almost instantly in order to be effective (one breath should contain a lethal dose of the agent). To achieve this, the primary weapons used would be rocket artillery or bombs and large ballistic missiles with cluster warheads. The contamination in the target area is only low or not existent and after four hours sarin or similar agents are not detectable anymore.
Modern d,octrine requires very high .concentrations almost instant.ly in order to be effective (one breath should contain a lethal dose of the agent). To achieve this the primary weapons used would be rocket artillery or bombs and large ballistic missiles with cluster warheads The contamination in the target area is only low or not existent and after four hours sarin or similar agents are not detectable anymore