; and (B) specifically to address and accommodate unique and complex occurrences of winter ozone in accordance with this section. (2) Requirements The regulations promulgated pursuant to paragraph (1) shall provide— (A) sufficient timelines for the Administrator and State, local, and tribal governments to conduct air shed inventories, scientific research and studies necessary for the Administrator and State, local, and tribal governments to identify winter ozone causes (including precursors), and take appropriate actions necessary— (i) (I) to create accurate emissions inventories and carefully model winter ozone using the most current tools available; and (II) over a sufficient period of time, comprehensively to identify the variety of situations that typically contribute to elevated winter ozone levels; (ii) (I) to fully analyze best available science and data to determine background ozone levels; and (II) to identify meteorological, geographical, and other factors leading to elevated winter ozone levels; and (iii) to effectively identify, develop, and implement air pollution control strategies that the Administrator and State, local, and tribal governments agree are the highest-priority activities to reduce winter ozone levels; and (B) notwithstanding section 3(a)(2)(D), given the complexities of winter ozone occurrences, a minimum of 10 years after the date on which the Administrator approves an early action compact plan for the reduction of winter ozone levels under the Early Action Compact Program.