The IARC has also specified that it is common to use elemental carbon, which makes up a significant proportion of those emissions, as a marker of exposure.
Tá sé sonraithe freisin ag IARC gur gnáth go n-úsáidtear an carbón eiliminteach, ar cuid shuntasach de na hastaíochtaí sin é, mar chomhartha nochta.