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.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:

How much naphthalene is harmful for human?

### Response:

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.
