Approval and Promulgation of Implementation Plans; State of Iowa

EPA is approving a State Implementation Plan (SIP) revision submitted by the state of Iowa for the purpose of establishing exemptions for indoor sources of air pollution that are not directly vented to the outside but have emissions that leave the building through doors, vents or other means. This revision also clarifies that the permitting exemptions do not relieve the owner or operator of any source from any obligation to comply with any other applicable requirements. The state has demonstrated that air pollution emissions from this equipment are negligible and these exemptions are likely to result in no significant impact on human health or the environment. We have reviewed the state's justification for the revisions and agree with its conclusions.