Hanoi-Vietnam: Permissible exposure limit value of silica dust at the workplace

16:25, 10/07/2024

The content is detailed in Circular 02/2019/TT-BYT issuing the National technical regulation on dust - Permissible exposure limit values of 05 dusts at the workplace in Vietnam.

The permissible exposure limit value of silica dust at the workplace is stipulated in the following table:

Unit: mg/m3

No.	Name of substance	TWA
1.	Concentration of free silica in total dust	0,3
2.	Concentration of free silica in respirable dust	0,1

Additionally, the determination of the concentration of free silica in total dust and respirable dust is carried out according to the following formula:

C_TP (mg/m³)	=	Concentration of total dust (mg/m³) x Percentage of free silica (%)
		100

C_HH (mg/m³)	=	Concentration of respirable dust (mg/m³) x Percentage of free silica (%)
		100

Where:

- C_TP (mg/m³): Concentration of free silica in total dust, unit: mg/m³

- C_HH (mg/m³): Concentration of free silica in respirable dust, unit: mg/m³

Permissible exposure limit value of non-silica dust may be found in Circular 02/2019/TT-BYT effective from September 22, 2019.

- Thanh Lam -

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