| 31. | It is 1 . 0 parts per million, not 0 . 1 part.
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| 32. | The concentration of methane can be as high as 500 parts per million.
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| 33. | Anything over 50 parts per million is classified as toxic waste.
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| 34. | It increased to 3 in 80 at 175 parts per million.
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| 35. | During that span, concentrations never rose above 280 parts per million.
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| 36. | Humans can detect capsaicin at levels of one part per million.
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| 37. | FDA documents show that methylmercury levels in swordfish average 1 part per million.
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| 38. | The median concentration in this location is 35.5 parts per million.
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| 39. | The FDA's limit on allowable mercury in seafood is 1 part per million.
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| 40. | Dissolved oxygen : 10 ppm ( parts per million ).
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