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.
Temperatures in Finland last month were between 1.5 and 3.5 degrees Celsius warmer than normal in most parts of the country.
A heatwave is hitting Kitikmeot and Kivalliq communities this week bringing temperatures above 30 C (86 F), twice as high as the average temperature for these regions at this time of year.
Wildfires across the western United States and Canada have put millions of people under air quality alerts, as thousands of firefighters battle the flames.
British Columbia experienced a historic heat wave, breaking 34 additional temperature records, some over a century old, with more heat anticipated in the interior regions.
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