daily time series of VMT reduction ratios from the INRIX Analytics big data assessment platform (https://inrix.com/covid-19-transportation-trends). This dataset is not publicly accessible because: Please contact Dr. Saravanan Arunachalam from UNC IE for more information. It can be accessed through the following means: Please contact Dr. Saravanan Arunachalam from UNC IE for more information. Format: Please contact Dr. Saravanan Arunachalam from UNC IE for more information. This dataset is associated with the following publication: Arter, C., J. Buonocore, V. Isakov, G. Pandey, and S. Arunachalam. Air pollution benefits from reduced on-road activity due to COVID-19 in the U.S.. PNAS Nexus. Oxford University Press, OXFORD, UK, 3(1): pgae017, (2024).