What is the size range of asbestos fibers that can be inhaled?

The size range of asbestos fibers that can be inhaled is between 0.3 to 5.0 microns. This range is significant because particles in this size category are capable of penetrating deep into the lungs when inhaled, posing serious health risks such as asbestosis, lung cancer, and mesothelioma.

Particles less than 0.3 microns might not settle out of the air quickly and may be filtered by the upper respiratory tract, meaning they are less likely to reach the deep lung area. On the other end, fibers larger than 5.0 microns are generally too large to be inhaled deeply into the lungs and are more likely to be trapped in the upper parts of the respiratory system or expelled through natural processes like coughing. Thus, the significance of the range between 0.3 to 5.0 microns directly correlates with the potential for long-term health effects associated with asbestos exposure.