Current monitoring shows that Class I areas in Maine have regional haze conditions better than the State Implementation Plan modeling glide path.
The goal of the Clean Air Act is to achieve natural visibility (regional haze) conditions by 2064 at Class I areas (primarily large National Parks and Wilderness Areas). Every 10-years (starting in 2007) Maine DEP submits to EPA a reasonable progress strategy plan to approach that goal. The plot below shows that the current 10-year plan is being achieved at Class I areas in Maine for the 20% worst visibility days. Dashed lines represent uniform glide paths to the current 10-year plan modeled (CMAQ) goals. The units in the plot are deciviews where one deciview represents the minimal perceptible change in visibility to the human eye.
Contact: Tom Downs (207) 287-7026