a completed spreadsheet model with analysis results; and, a memo saved as an MS Word or PDF file. CleanAirActof1990_2023Spring.pdf ScreenShot2023-04-28at4.57.01PM.png 1 Clean Air Act of 1990 In the late 1980s, various states and the US Congress debated placing limits on sulfur emissions to reduce the impact of acid rain. Utilities […]