| 11. | For comparison permissible exposure level of heptane is much higher at 500PPM TWA.
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| 12. | I remember reading somewhere that there is no safe exposure level for it.
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| 13. | "There is significant uncertainty around the each county's exposure level, " he said.
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| 14. | But personal exposure levels indoors increased from south to north.
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| 15. | OSHA allows much lower permissible exposure level for these chlorinated solvents compared to heptane.
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| 16. | Three exposures of the same image at different exposure levels.
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| 17. | Concentrations as low as 667 OSHA limits long-term workplace exposure levels above 50 ppm.
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| 18. | Other researchers say there is no way to calculate the exposure levels for sure.
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| 19. | Thirty workers conducting operations at the plant had exposure levels greater than 100 mSv.
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| 20. | There was no way of knowing what the actual exposure level of an individual was,
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