Passed in 2011, Chicago’s Clean Diesel Construction ordinance bans pre-Tier 1 vehicles from City of Chicago construction sites, unless such vehicles use particulate filters. The ordinance also applies a scoring system to contractors’ vehicles based on engine model year, use of a diesel emission control retrofit device, fuel type, and other factors. Chicago applies minimum clean fleet scores to its construction contractors; the minimum score established for 2014 increases in 2017 and again in 2020.
