The size of the Respirable Suspended Particulate Matter (R.S.P.M) in air:
- Amore than 7 μm (micron)
- Bmore than 6 μm (micron)
- Cmore than 5 μm (micron)
- Dless than 5 μm (micron)
Show answer and explanation
Correct answer: (d) less than 5 μm (micron)
Explanation
Respirable Suspended Particulate Matter (RSPM) consists of fine particles small enough to be inhaled deep into the lungs, with size less than 5 µm.
Larger particles (more than 5-10 µm) are trapped in the upper respiratory tract and are not respirable.
RSPM is mainly produced from combustion, vehicles and industrial sources.