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In the early weeks of the coronavirus pandemic in 2020, doctors noticed a surprising silver lining: Americans were having fewer heart attacks. One likely reason, according to an analysis published last month by researchers at the University of California, San Francisco, is that people were inhaling less air pollution. Millions…

Want to get this newsletter in your inbox? Here’s the sign-up.) Good evening. Here’s the latest at the end of Tuesday. The U.N. secretary general called for a four-day humanitarian pause in the war to mark Easter in the Eastern Orthodox Church. He acknowledged that previous cease-fire calls had failed….

On Monday, a federal judge struck down a nationwide mask mandate on airplanes, trains, buses and other public transportation. The ruling left it up to individual airlines and local transit agencies to decide what to do. By late Monday, the nation’s largest airlines had dropped their mask requirements for domestic…

For two years, covered faces in airports and on airplanes were a persistent reminder of the hold that the coronavirus had on air travel. The end of the mask mandate on planes and other forms of transportation this week marked the latest advance in the airline industry’s effort to return…

A sprawling Soviet-era steel factory that is sheltering thousands of soldiers and civilians is the last Ukrainian redoubt in the ravaged city of Mariupol, where the battle by Russian forces to take full control of the city appears to be entering its final stages. Russian commanders said Tuesday they were…

As coronavirus infections tick up across the United States, there’s a lot of confusion about if, and when, to wear a mask. “This is the hardest thing of all because it’s not just the risks and benefits to you,” said Dr. Robert Wachter, a professor and the chair of the…