The Bulletin of the Atomic Scientists announces the latest decision on the "Doomsday Clock" minute hand, Tuesday, Jan.  23, 2024, at the National Press Club Broadcast Center, in Washington.  This year, Jan.  2024, the clock will remain set to 90 seconds to midnight.  (AP Photo / Jacquelyn Martin)

Today's best photos: From the Doomsday Clock to Trump's New Hampshire win



More from The National:

Tuesday's best photos: From Elon Musk at Auschwitz to Chanel's Haute-Couture show

Monday's best photos: From a penguin hatchling to snow-covered terraces

Sunday's best photos: From soldiers clearing snow to an ice-cream theme park

Saturday's best photos: From a Hindu devotee in India to an icy dip in Russia

Friday's best photos: From a Spanish beach to a Russian pond

Thursday's best photos: From blessed pets to frozen flowers

How to protect yourself when air quality drops

Install an air filter in your home.

Close your windows and turn on the AC.

Shower or bath after being outside.

Wear a face mask.

Stay indoors when conditions are particularly poor.

If driving, turn your engine off when stationary.

Updated: January 24, 2024, 5:30 PM