More from The National:
Monday's best photos: from Boxing Day shoppers to a turban-tying competition
Sunday's best photos: Icicles in US storm, dressed-up dogs and plenty of festive spirit
Saturday's best photos: from St Paul's choir to Arabian horse racing in Liwa
Friday's best photos: from Biden among Christmas trees to winter solstice at Stonehenge
Thursday's best photos: from nuns in the Vatican to Zelenskyy in Congress
Wednesday's best photos: from penguins in the Antarctic to Santa in Corsica
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.
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