New data obtained by The Guardian provides a more specific look at how the changes implemented by Postmaster General Louis DeJoy affected the U.S. Postal Service's on-time first-class mail delivery rate after he took over the role in June.

In what North Carolina A&T history professor and former postal worker Philip Rubio described as a "remarkable graphic illustration," The Guardian shows that rates plummeted not long after DeJoy stepped in. The USPS was delivering first-class mail on time about 93 percent of the time during most of the first half of 2020, just shy of its 95 percent goal, and was averaging nearly 91 percent at the moment of leadership transition. But by August the national rate had dipped to about 81.5 percent, and was even lower in some postal districts, reaching as far south as 63.6 percent in northern Ohio and just over 61 percent in Detroit, although it's worth pointing out that Detroit had also fallen well below the national average for multiple weeks earlier in 2020, jumping back up shortly before DeJoy arrived. As The Guardian notes, those districts are both in key swing states, which will likely raise some eyebrows, given that DeJoy has already had critics accuse him of trying to slow deliveries with an increase in mail-in ballots expected for the general election because of the coronavirus pandemic.

DeJoy denied those allegations during congressional testimony and explained that any slowdowns that occurred were the result of a bumpy transition. DeJoy went on to pause the reforms he put in place until after the election, but The Guardian's analysis shows that delivery speed is still lagging in several districts. View the trends of delivery rates in postal districts across the country at The Guardian. Tim O'Donnell