WASHINGTON — President Joe Biden is commuting the sentences of roughly 1,500 people who were released from prison and placed on home confinement during the coronavirus pandemic and is pardoning 39 Americans convicted of nonviolent crimes. It’s the largest single-day act of clemency in modern history.

The commutations announced Thursday are for people who have served out home confinement sentences for at least one year after they were released. Prisons were uniquely bad for spreading the virus and some inmates were released in part to stop the spread. At one point, 1 in 5 prisoners had COVID-19, according to a tally kept by The Associated Press.

Biden said he would be taking more steps in the weeks ahead and would continue to review clemency petitions. The second largest single-day act of clemency was by Barack Obama, with 330, shortly before leaving office in 2017.

The clemency follows a broad pardon for his son Hunter, who was prosecuted for gun and tax crimes. Biden is under pressure from advocacy groups to pardon broad swaths of people, including those on federal death row, before the Trump administration takes over in January. He’s also weighing whether to issue preemptive pardons to those who investigated Trump’s effort to overturn the results of the 2020 presidential election and are facing possible retribution when he takes office.

Those pardoned Thursday range in age from 36 to 75. About half are men and half are women, and they had been convicted of nonviolent crimes such as drug offenses, fraud or theft and turned their lives around, White House lawyers said. They include a woman who led emergency response teams during natural disasters; a church deacon who has worked as an addiction counselor and youth counselor; a doctoral student in molecular biosciences; and a decorated military veteran.