A cikin 'yan shekarun nan, tare da aiwatar da ƙa'idodin ingancin iska a cikin mota, ingancin sarrafa mota da matakin VOC (Ƙungiyoyin Halittu masu rikitarwa) sun zama muhimmin sashi na ingancin ingancin motoci. VOC shine umurnin mahaɗan kwayoyin halitta, galibi yana nufin gidan abin hawa da sassan kayan kaya ko kayan haɗin mahaɗan, galibi sun haɗa da jerin benzene, aldehydes da ketones da undecane, butyl acetate, phthalates da sauransu.
Lokacin maida hankali na VOC a cikin abin hawa ya kai wani matakin, zai haifar da alamu kamar ciwon kai, tashin zuciya, amai da gajiya, har ma yana haifar da tashin hankali da coma a cikin mawuyacin hali. Zai lalata hanta, koda, ƙwaƙwalwa da tsarin juyayi, wanda ke haifar da asarar ƙwaƙwalwar ajiya da sauran mummunan sakamako, wanda ke barazana ga lafiyar ɗan adam.