You may have been wondering about the recent vibrant, reddish sunsets and hazy skyline in Chicago.What's behind these phenomena can be traced back to a combination of particulate matter and smoke from Canadian wildfires and pollutants that create ground-level ozone.These conditions have occurred before, as recently as last July when wildfires in the western United States caused red suns and moons and hazy skies to be visible across Illinois.
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