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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
航空数据分析公司“睿思誉”数据显示，阿联酋航空、卡塔尔航空和阿提哈德航空公司，每日在上述三大机场中转的旅客数量约9万人次，从那里前往中东各地的旅客则更多。