In Krakow, 17.96 nanograms per cubic meter; in New York City, 2.26.

在克拉科夫，每平方米17.96纳克；在纽约，每平方米2.26纳克。

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These steel ball bearings have a density of about 7,800 kilograms per cubic meter.

这些钢珠的密度是，每立方米7800千克。

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During one dust storm, airborne aluminum concentrations exceeded 1,400 micrograms per cubic meter.

一场沙尘暴中，空气中的铝浓度会超过1400微克每立方米。

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The World Health Organization considers the safe daily level to be 25 micrograms per cubic meter.

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And from this year, new facilities are to meet the tougher international standard of 0.1 nanograms per cubic meter.

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It spews 500 nanograms of dioxin per cubic meter of fume, more than six times the Japanese safe level of 80 nanograms.

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