What is the threshold limit value of asbestos dust as per revised mines safety regulations?

The threshold limit value of asbestos dust as per revised mines safety regulations is 5 mppcf (million particles per cubic foot). This limit is crucial as it is established to protect workers from the health risks associated with asbestos exposure, which can lead to serious respiratory illnesses, including asbestosis and lung cancer.

Setting the limit at 5 mppcf reflects a balance between necessary operational demands in mining and the imperative of safeguarding worker health. This threshold is scientifically based on research into the effects of asbestos exposure, ensuring that acceptable levels of particulate matter do not endanger the workforce. It ensures that miners are not exposed to quantities of asbestos that could lead to detrimental health effects over time.

Other options suggest higher limits, which do not align with the current acceptable standards aimed at mitigating health risks associated with asbestos. Therefore, the selection of 5 mppcf as the threshold limit is an important measure in occupational safety and health regulations.