Wildfires across the western United States and Canada have put millions of people under air quality alerts, as thousands of firefighters battle the flames.
The smoke particles have already reached high into the atmosphere, so they won't cause health problems or unusual odours. The most colourful sunset is expected on Tuesday evening.
The Tustumena Lake fire in Alaska is 25% contained, with efforts including smokejumpers and over 56,000 gallons of water deployed to combat the 35-acre blaze.
The McDonald Fire has grown to over 39,000 acres west of the Tanana River, with statewide fires consuming 72,000 acres; critical fire danger and smoke advisories are in effect.
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