It's a common complaint: Fly on a crowded plane and come home with a cold. What's in the air up there?

经常有这样的抱怨：搭乘了一班拥挤的飞机，回到家就感冒了。机舱的空气中究竟充满了什么？

Air travelers suffer higher rates of disease infection, research has shown. One study pegged the increased risk for catching a cold as high as 20%. And the holidays are a particularly infectious time of year, with planes packed full of families with all their presents and all those germs.

研究表明，航空旅客感染疾病的比率比一般人要高。某项研究更是显示，航空旅客染上感冒的风险较一般人高出了20%之多。尤其是各种假期，往往成为一年当中最容易被传染疾病的时间段，飞机上到处是举家出游的人们，而与他们同行的，还有各种各样的病菌。

Air that is recirculated throughout the cabin is most often blamed. But studies have shown that high-efficiency particulate air (HEPA) filters on most jets today can capture 99.97% of bacterial and virus-carrying particles. That said, when air circulation is shut down, which sometimes happens during long waits on the ground or for short periods when passengers are boarding or exiting, infections can spread like wildfire.

最常遭到诟病的是空气在机舱内的循环流动。但研究表明，如今大部分飞机上的高效微粒空气过滤器能够滤掉99.97%的细菌和病毒微粒。然而，当空气不流通时，例如飞机在地面等候时间过长时或者乘客上下机的时间，细菌和病毒就可能像瘟疫一样快速散播。

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