 How much naphthalene is harmful for human?
 The NIOSH recommended time weighted average (TWA) exposure limit for naphthalene is under 50mg/m³ or 10 ppm, above which will cause significant harm to humans.
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<|USER|> How much naphthalene is harmful for human?
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 The NIOSH recommended time weighted average (TWA) exposure limit for naphthalene is under 50mg/m³ or 10 ppm, above which will cause significant harm to humans.
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