| 11. | The average level in the United States was about 5 parts per million.
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| 12. | Wheat and corn contain seven and three parts per million respectively.
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| 13. | On average, germanium makes up 1 part per million of soil.
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| 14. | Around Fort Edwards, she said, the tested eggs averaged 42 parts per million.
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| 15. | Cyanide can be fatal in concentrations above 2 parts per million.
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| 16. | The current standard is 0.12 parts per million over one hour.
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| 17. | Tin makes up 428 parts per million of the human body.
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| 18. | And there was about 23 parts per million of carbon monoxide.
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| 19. | Diesel fuel now has about 500 parts per million sulfur content.
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| 20. | The peak ozone level this year stood at . 26 parts per million
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