Air in the breathing zone (about 30cm from the mouth) was sampled for each trip to measure PM concentrations.

研究者在每个参试者嘴巴前30厘米区域采集空气样本并测量颗粒物质浓度。

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If [sprays are] used, people can protect themselves by opening Windows, avoiding the application near the breathing zone, and by using masks or other types of personal respiratory protection.

如果一旦使用了喷雾剂，可以通过开窗，不在呼吸区域使用，应用面罩或其他的个人呼吸道保护措施来保护自己。

youdao

The possibility of suck-back of fume cupboard exhaust gases into building air intakes, open Windows or the breathing zone of people working on the roof or in other buildings should be investigated.

应该调查通风橱废气回吸至房屋内的进风口、打开的窗户或者房顶工作人员的呼吸区域或者其它房屋的可能性。

youdao

If your job makes you feel dreary, it could be time to introduce vegetation to your personal breathing zone -- an area of six to eight cubic feet (0.2 cubic meters) -- where we spend most of our working day.

CNN: Office foliage for feel good factor

The scheme is designed to protect weak links in the euro zone for the next three years, buying them the breathing space to shore up public finances, clean up banks and retool uncompetitive economies so they can grow again and pay off their debts.

ECONOMIST: Charlemagne

Each device plugs into Apple's iPad, iPhone or iPod Touch, and digitally monitors heart rate and breathing patterns, offering on-screen coaching to get you into a calmer zone.

WSJ: Review of Tink�� and HeartMath Inner Balance Sensor for iOS