We all know we shouldn't eat dirt, but we do it anyway. Mostly not on purpose – dirt gets into our bodies all day, every day, whether we want it to or not. It's understandably difficult to figure out exactly how much is getting in, but that might be beside the point.
我们都知道不该吃灰尘,但总会吃到。大多数时候都不是故意的——不管我们想不想,灰尘每天都从早到晚地进入我们体内。可以理解,想要准确计算我们每天吸入多少灰尘是很难的,但这并不重要。
We get our daily dirt allowance in all kinds of ways, from contaminated food, dust inhalation, and from not washing our hands before eating. The Environmental Protection Agency (EPA) has compiled an enormous amount of research on dirt consumption. About 45 percent of the stuff we inhale or inadvertently eat is soil, and 55 percent is dust.
我们每天以各种方式吸入灰尘,通过脏的食物、吸入的尘土、还可能是因为吃东西之前没洗手。环境保护署汇集了大量关于吸入灰尘的研究,我们吸入或无意间吃下去的大约45%是土,55%是灰尘。
The EPA numbers on unintentional dirt consumption focus on children, with one study reporting that babies from 6 weeks to 1 year old generally get 60 milligrams a day. From ages 1 to 20, that amount goes up to 100 milligrams a day. If you take those daily numbers and make them annual, that would be 36,500 milligrams or 1.3 ounces per year.
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