Research was conducted in summer 2020 to analyze the effect of the shutdown orders due to COVID-19 pandemic on the CO levels across the United States. Since the shutdown orders during the pandemic prevented any public places from operating or conducting any kind of business, the hypothesis was that the CO levels would go down since there was no commute happening or buildings being used. Data was collected from the EPA’s Air Quality public data and analyzed in R: a powerful program used to analyze large datasets. The 15 states analyzed were based on the greatest number of cases on August 20th 2020. Each state had its data, with multiple counties and with multiple sites in each county. In almost every single state, the CO levels went down starting from February, with the lowest CO levels during the shutdown, indicating that the shutdown likely could have led to a decrease in CO levels. As some states opened, the CO level started rising then fluctuating.