Scientistscalledformoreresearchintothesafetyofnanoparticles,warningthattherisklayinbreathinginmaterialssosmallthattheycanslipthroughmembranesinsidethebody.Researchonratshasshownnanoparticlesdepositedinthenosecanmigratetothebrainandmovefromthelungsintothebloodstream.Thenewmaterialsbeingdevelopedthroughnanotechnologymighttriggerseverereactionsfromthebody'simmunesystem.
科學家呼籲深入研究納米粒子的安全性，指那些粒子小得可以滲透人體內的膜，吸入會有危險。以老鼠作的研究顯示，納米粒子可由鼻通往腦部、由肺通入血管。用納米技術研發的新物質，可能引起人體免疫系統強烈反應。