Levels of the gas at the Zeppelin research station on Svalbard, northern Norway, last week peaked at over 397 parts per million (PPM), an increase of more than 2.5ppm on 2008.

挪威北部斯瓦尔巴群岛上的齐柏林研究站上周记录的二氧化碳气体水平最高值超过397个百万分点，比2008年的水平增加了2.5个百万分点。

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The pre-industrial carbon dioxide amount was 280 parts per million (ppm). Humans, by burning coal, oil and gas, have increased this to 385 ppm; it continues to grow by about 2 ppm per year.

在前工业时代，二氧化碳含量为280ppm，人类燃烧煤炭和油气的行为使其上升到385ppm，而这一数值还在以每年2ppm的速率增长。

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A commonly cited goal is to stabilize GHG concentrations around 450-550 parts per million (PPM), or about twice pre-industrial levels.

一个共同的目标是使温室气体在空气中的浓度稳定在450 - 550ppm(注二)，或者大约两倍于工业化前的水平。

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According to Roberto, the wastewater starts with about 35, 000 parts per million (ppm) of gunk and junk.

FORBES: DONQ: LEADING LIQUOR TO SUSTAINABILITY

We would need atmospheric CO2 levels of around 500 parts per million (ppm) to kill off the process of calcification completely, reports Mother Jones.

CNN: All About: Coral Reefs

Concentrations of CO2 in the atmosphere currently stand at 385 parts per million (ppm) and are rising at a rate of two ppm per year.

CNN: Carbon dioxide levels already a danger