In 2007, the City Council formed an Ad Hoc Clean Air Counts Advisory Committee to assist the City in meeting the goals of the Clean Air Counts Campaign. The Metropolitan Mayors Caucus formed the Clean Air Counts Campaign in 1999. Over 100 local governments, including Crystal Lake, and about 300 businesses and institutions committed to emission reduction measures such as energy conservation, vehicle idling policies, use of non-polluting pain and clean products, and more. The City's Ad Hoc Clean Air Counts Committee met many achievements of the Clean Air Counts Campaign, which included attaining Bronze and Silver membership status.
The Metropolitan Mayors Caucus has since ended the Clean Air Counts Campaign. In efforts to continue to assist the City of Crystal Lake in promoting environmental sustainability within the City, at the November 17, 2015 City Council meeting, the City Council approved the former Ad Hoc Clean Air Counts Advisory Committee to become the City's new Sustainability Committee. The Sustainability Committee will more broadly assist the City with promoting and achieving environmental sustainability initiatives, while continuing their efforts they the Committee have established through the former Ad Hoc Clean Air Counts Advisory Committee.