EPA is approving a revision to the New Hampshire State Implementation Plan (SIP) that addresses regional haze for the first planning period from 2008 through 2018. The revision was submitted by the New Hampshire Department of Environmental Services (NHDES) on January 29, 2010, with supplemental submittals on January 14, 2011, and August 26, 2011. This revision addresses the requirements of the Clean Air Act (CAA) and EPA's rules that require States to prevent any future, and remedy any existing, manmade impairment of visibility in mandatory Class I Areas caused by emissions of air pollutants from numerous sources located over a wide geographic area (also referred to as the "regional haze program").