A smog filled day in Chicago in 2009 (Source: Chicago Tonight) Environmental State Attorneys General File Lawsuit Against EPA for Flouting Clean Air Requirements by Rosemary Piser on December 7, 2017 Rosemary Piser Author More in Environmental: People Outside Will Be Injured: Severe Thunderstorms Strike Park Forest March 31, 2026 Park Forest Officials Urge Residents to Protect Pipes as Coldest Air of the Season Continues December 14, 2025 Park Forest Workshops Join Global Effort to Prevent Bird Collisions August 21, 2025 A smog filled day in Chicago in 2009 (Source: Chicago Tonight)