The abbreviations on this page were originally defined on the United States Environmental Protection Agency website. I/A: Innovative/Alternative IA: Interagency Agreement IAAC: Interagency Assessment Advisory Committee IADN: Integrated Atmospheric Deposition Network IAG: Interagency Agreement IAP: Incentive Awards Program. Indoor Air Pollution IAQ: Indoor Air Quality IARC: International Agency for Research on Cancer IATDB: Interim Air Toxics Data Base IBSIN: Innovations in Building Sustainable Industries IBT: Industrial Biotest Laboratory IC: Internal Combustion ICAP: Inductively Coupled Argon Plasma