为纽约时报国际生活网站撰写月度健康专栏的圣西睿智医生(Richard Saint Cyr)在北京执业,他通过电子邮件接受采访称,“消费者对哪些口罩最好完全是一头雾水。有些的确是会帮倒忙,比如人们获得了错误的保证,戴着不起作用的口罩在室外待更长的时间。”
Many masks worn around Asia are simple surgical-type masks. But these are designed to prevent problems like splattering blood, not to block tiny particles, Benjamin Cowling, an associate professor of public health at the University of Hong Kong, said in an email. "It is pretty common knowledge that surgical face masks have almost no filtration efficiency against pollutants," he said.
亚洲各地采用的许多口罩就是简单的医用口罩。香港大学公共卫生学副教授高本恩(Benjamin Cowling)在电子邮件中表示,这种口罩的设计用途是防止血液飞溅之类的问题,而不是阻挡细颗粒物。“医用口罩在过滤污染物方面几乎无效,这是很基本的常识,”他说。
Surgical masks are made of polypropylene, according to Wallace Leung, director of the Research Institute of Innovative Products and Technologies at the Hong Kong Polytechnic University. His tests found that at a standard airflow velocity, basic masks captured only 20 to 25 percent of tiny particles of 50 to 500 nanometers — a size common in diesel vehicles' exhaust. Such particles, less than 1 percent of the width of a human hair, are of particular concern because they can get buried deep in the lungs and end up in the bloodstream. The figures do not include any gap between the mask and the face that allows air to come in, further reducing efficiency
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