10 things you need to know today: December 21, 2021

Fast-spreading Omicron now accounts for 73 percent of new U.S. COVID cases, the EPA unveils tightest auto emissions rule yet, and more

Waiting for a COVID test in New York City
Waiting for a COVID test in New York City
(Image credit: Spencer Platt/Getty Images)

1. Omicron surges, accounting for 73 percent of new COVID cases

The new Omicron coronavirus variant has spread explosively and now accounts for 73 percent of U.S. cases, after increasing six-fold in one week, the Centers for Disease Control and Prevention said Monday. Cities across the United States on Monday continued to step up restrictions to combat the surge, as rising Omicron infections added to ongoing cases from the previously dominant Delta strain. Boston Mayor Michelle Wu (D) announced that the city, one of many where cases are spiking, would require proof of vaccination for people entering some indoor spaces, including restaurants and gyms. Washington, D.C., revived an indoor mask mandate as daily infections jumped to three times the level seen at the beginning of December.

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Harold Maass, The Week US

Harold Maass is a contributing editor at The Week. He has been writing for The Week since the 2001 debut of the U.S. print edition and served as editor of TheWeek.com when it launched in 2008. Harold started his career as a newspaper reporter in South Florida and Haiti. He has previously worked for a variety of news outlets, including The Miami Herald, ABC News and Fox News, and for several years wrote a daily roundup of financial news for The Week and Yahoo Finance.