Assertion: napoleon's level | /r/HasProperty | 0.8 ppm
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text: Interpreting the results is therefore a delicate task, especially given that the “normal” level of arsenic by current reckoning is 0.8 ppm, rising to as much as 2 or 3 ppm, and higher when the atmosphere is polluted; we can only speculate about what the standard level might have been on St. Helena in the early 19th century.