Monitoring air pollutants via plants is an economic, convenient and credible method compared with the traditional ways.

和传统的监测方法相比，利用植物监测大气污染物是一种经济、简便而且可靠的方法。

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In the past two years, the WHO's database of cities monitoring air pollution has nearly doubled - now covering 3000 cities in 103 countries.

在以往两年里，世卫组织的城镇空气污染监督数据库扩大了将近一倍，目前已覆盖103个国家的3000个城镇。

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A measurement style of not touching is used during monitoring air dynamical field in a furnace with acoustic method, which is modern high-tech control means.

声波法监测炉膛空气动力场采用非接触的测量方式，是一种现代高科技控制手段。

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Marathon organisers are also monitoring the air pollution levels in London for any change caused by the volcanic eruption in Iceland.

BBC: Britain's Mara Yamauchi arrives in London for Marathon

Environmental health officers from Blaenau Gwent council told the meeting that monitoring suggested air pollution was not at a critical level, but this would continue.

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Jones added sensors that, by monitoring the air temperature above and below the heli ten times a second, can keep the chopper at a fixed altitude with more accuracy than a human on the ground can.

FORBES: Eye in the Sky