On 12 June 2012, the World Health Organisation, through its International Agency for Research on Cancer, reclassified diesel engine exhaust emissions as ‘carcinogenic to humans’ (Group 1), based on sufficient evidence that exposure is associated with an increased risk of lung cancer.
An 12 Meitheamh 2012, rinne an Eagraíocht Dhomhanda Sláinte, trína Ghníomhaireacht Idirnáisiúnta um Thaighde ar Ailse, athaicmiú ar an sceitheadh astaíochtaí ó innill díosail mar “carcanaigineach don duine” (Grúpa 1), bunaithe ar fhianaise leordhóthanach go méadaítear an riosca ailse scamhóg a tholgadh i gcás nochtadh.