The smoke is from numerous wildfires burning in Canada’s Yukon Territory.
Three volcanoes are erupting across the Aleutian Range — Great Sitkin and Semisopochnoi in the Aleutian Islands and Pavlof Volcano on the Alaska Peninsula.
After a cold winter and spring, high temperatures around the Interior prompted birch tree buds to burst, sending record-setting levels of pollen into the air.
Parts of Interior and Southcentral Alaska will see poor air quality as a result of wildfires this week, the Alaska Department of Environmental Conservation warned on Tuesday.
Strong southerly winds picked up loose ash from a 1912 volcanic eruption, sending an ash cloud about 4,000 feet into the sky.
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