Which type of Particulate Matter (PM) is also commonly known as Respirable Suspended Particulate Matter (RSPM)?

Respirable suspended particulate matter refers to particles of ten micrometres and below, that is PM10.

The finer class below one micrometre is a narrower fraction than the respirable label.

The fine fraction below 2.5 micrometres is not the standard respirable label.

A five-micrometre class is not a standard regulatory size.

The ten-micrometre cut-off matches the classic respirable definition.

Particles of this size lodge deep in the lungs and cause respiratory harm.