Tarin abubuwan da ke haifar da gurɓacewar iska daga AP 42 tarin bayanai ne na Hukumar Kare Muhalli ta Amurka (EPA) game da gurbatar iska, wanda aka fara bugawa a shekarata 1968. As of 2018[update] , bugu na ƙarshe shine na 5th daga 2010. AP 42 Compilation of Air Pollutant Emission Factors shine tarin abubuwan da ke fitar da gurbacewar iska, a wasu kalmomin lambobi waɗanda ke da alaƙa da adadin gurɓataccen abu da aka fitar a cikin sararin samaniya tare da wani aiki. Ma'aikatar Kiwon Lafiyar Jama'a ta Amurka ce ta fara tattara wannan tarin kuma ta buga shi a cikin shekarar 1968. A cikin shekarar 1972, an sake dubawa kuma an fitar da shi azaman bugu na biyu ta Hukumar Kare Muhalli ta Amurka EPA. A cikin shekarar 1985, bugu na huɗu na gaba ya kasu kashi biyu: Juzu'i na tun daga lokacin ya haɗa da ma'ana mai tsayayye da abubuwan fitar da tushen yanki, kuma juzu'i na II ya haɗa da abubuwan fitar da tushen wayar hannu . Juzu'i na I a halin yanzu yana cikin bugu na biyar kuma ana samunsa akan Intanet.