The lower deck of an aircraft is usually used as cargo space. The various cargo sections are known as the hold and differ according to their position in the aircraft.
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Explosives and flammable items, such as fireworks, gas, and aerosols. Poisonous and toxic substances, including pesticides and certain chemicals. Lithium batteries and other hazardous materials, as these can pose a safety risk if not handled properly.
The hold is pressurized. There is plenty of oxygen, but some airline cargo holds are not climate-controlled, Thompson said. During Sunday's flight from Charlotte to Washington, the Embraer E170 reached an altitude of 27,000 feet, according to FlightAware, an airline tracking website.
Rules on when to ventilateDew-point rule Ventilate when the dew point of the outside air is lower than the dew point of the air in the hold. Three-degree rule Ventilate a hygroscopic cargo if the temperature of the outside air is at least 3°C below that of the cargo temperature (taken at loading).