Mu myaka yashize, hamwe n’ishyirwa mu bikorwa ry’imiterere y’ikirere cy’imodoka, ubuziranenge bw’imodoka hamwe n’urwego rwa VOC (volatile Organic Compound) rwabaye igice cyingenzi mu igenzura ry’imodoka. VOC ni itegeko ryibintu kama, cyane cyane bivuga akazu k’imodoka hamwe n’ibikoresho byo mu mizigo cyangwa ibikoresho by’ibinyabuzima, cyane cyane birimo urukurikirane rwa benzene, aldehydes na ketone na undecane, butyl acetate, phthalate nibindi.
Iyo kwibumbira hamwe kwa VOC mumodoka bigeze kurwego runaka, bizatera ibimenyetso nko kubabara umutwe, isesemi, kuruka numunaniro, ndetse bigatera guhungabana na koma mubihe bikomeye. Bizangiza umwijima, impyiko, ubwonko na nervice sisitemu, bikaviramo kubura kwibuka nizindi ngaruka zikomeye, bikaba bibangamiye ubuzima bwabantu.