The Siemens system, by contrast, consumes 1.8kwh per cubic metre, and the firm hopes to get that down to 1.5kwh.

相比之下，西门子公司的电化学方法每立方米消耗1.8千瓦时的电量，并且有望被降至1.5千瓦时每立方米。

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The guidelines say that, to prevent ill health, those levels should be lower than 20 micrograms per cubic metre.

准则指出，为了防止健康不良，这些水平应低于每立方米20微克。

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The Siemens system, by contrast, consumes only 1.8kwh per cubic metre, and the firm hopes to get that down to 1.5kwh.

然而，西门子的系统每立方耗能1.8 kWh就能达到效果，该公司希望降至1.5 kWh。

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The radon concentration in the average UK home is about 20 becquerels per cubic metre.

BBC: Radon

Action to deal with the problem is recommended when the concentration reaches 200 becquerels per cubic metre.

BBC: Radon

The limit, set by the European Union, is 40 micrograms of NO2 per cubic metre of air.

BBC: Dundee Biomass Centre