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並前往https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1048

1910.1048 - Formaldehyde. | Occupational Safety and Health ...

Action level means a concentration of 0.5 part formaldehyde per million parts of air (0.5 ppm) calculated as an eight (8)-hour time-weighted average (TWA) ...

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