S. no. | Country | Recommended value (gravimetric) | Comment |
---|---|---|---|
1 | Australiaa | 3 mg/m3 | Coal dust with ≤ 5% respirable free silica |
2 | Belgium | 10 mg/m3 % respirable quartz + 2 | |
3 | Brazil | 8 mg/m3 % respirable quartz + 2 | |
4 | Finland | 2.0 mg/m3 0.2 mg/m3 0.1 mg/m3 | Coal dust Quartz (fine dust < 5 pm) Silica: cristobalite, tridymite |
5 | Federal Republic of Germanyb | 0.15 mg/m3 4.0 mg/m3 | Quartz (including cristobalite and tridymite) Fine dust containing quartz (1% or greater quartz by weight) |
6 | Italy | 3.33 mg/m3 10 mg/m3 q + 3, where q = % of quartz (mass) | Coal dust with < 1% quartz Coal dust with > 1% quartz |
7 | Netherlands | 2.0 mg/m3c 0.075 mg/m3 | Coal dust (less than 5% respirable quartz) Silica: cristobalite, tridymite |
8 | Sweden | 0.05 mg/m3 | Silica: cristobalite, tridymite |
9 | UKc | 3.8 mg/m3 | Coal mine dust (average concentration at the coal face) |
10 | US (MSHA) | 2.0 mg/m3 10 mg/m3 % SiO2, 10 mg/m3 % respirable quartz + 2 Half of the value for quartz | Coal dust with − 3% silica Coal dust with > 5% silica Silica: quartz Silica: cristobalite, tridymite |
11 | Yugoslavia | 4 mg/m3 0.07 × 100 mg/m3 % FCS 0.07 mg/rn3 | Fine dust with < 2% free crystalline silica Fine dust with > 2% free crystalline silica Pure quartz (fine dust) |