窒息性物質

為了能夠一次運送最大量的氣體，多種氣體都會進行加壓。萬一發生洩漏，在氣體與大氣壓力相等時，它所佔的體積將比運輸時所用的容器要大得多。這可能會導致車輛周圍的氧氣遭到推移，而使附近的人和動物有潛在的窒息危險。此為窒息性。

In order to transport gasses in as big an amount as possible, many are transported pressurized. In case of a leak, as the gas is equalized with atmospheric pressure, it will take much greater volume than the tank it was transported in. This can cause dislocation of air around the train, potentially leading to suffocation of people and animals in its vicinity.

撇除危險性，窒息性氣體也能帶來助益。萬一發生洩漏事故，由於它們能將區域內的氧氣排除，它們能夠幫助滅火。