FIELD: collective security. SUBSTANCE: active collective protection of respiratory organs of people against poisonous or intoxicating substances is proposed in the form of gas-air screen, which is created by forming near-earth flat freely convective turbulent upward-directed gas-air current by way of heating near-earth layer of the air by a linear heat source located on the land surface against approaching poisonous air current. EFFECT: increased protection efficiency. 2 dwg
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