Connecticut's regional haze State Implementation Plan was sent to the Environmental Protection Agency (EPA) on November 18, 2009. EPA approved the SIP on July, 10, 2014.  

Pursuant to sections 169A and 169B of the Clean Air Act, the EPA requires states to submit regional haze SIPs that describe the states’ measures for meeting the national goal of a return to natural visibility conditions at Class I areas by 2064.  States with Class I areas must set reasonable progress goals for achieving and maintaining natural visibility conditions in their SIPs.  Connecticut does not contain any Class I areas.  States impacting Class I areas must submit SIPs detailing anticipated actions taken in order to meet reasonable progress goals, as well as explaining the long-term strategy, including enforceable emissions limitations, compliance schedules, and other measures for meeting said goals.  Regional haze SIPs are also required to include calculations of baseline and natural visibility conditions as well as monitoring strategies for tracking reasonable progress.  Finally, regional haze SIPs must include a determination of Best Available Retrofit Technology (BART) for sources of a certain size or emissions profile that began operating during a specific timeframe.  States, must also submit a "look-back" report every 5 years evaluating progress toward meeting reasonable progress goals and update the long-term strategy in 2018 as well as every 10 years thereafter. 

Before the regional haze SIP or Look-Back report can be approved by the EPA, a draft needs to be submitted to the Federal Land Managers (FLM) and the EPA for comments.  Following that, the next stage is to solicit comments from the general public and to hold a public hearing.  The final stage is to submit a final document to EPA for review and to have it published in the Federal Register.  The final document was submitted to the EPA on November 18, 2009 and approved on July 10, 2014.