The Economic Times

Why is the sky yellow in Boston? Canadian Wildfires turn skies orange across the US as thick smoke raises air quality concerns, nearly 100 million affected

Canadian Wildfires: Wildfire smoke from Canada has caused yellow skies and hazy conditions across the northeastern United States. This smoke traveled over one thousand miles from active wildfires burning in Canada. The tiny particles in the smoke block blue light, allowing yellow and orange wavelengths to pass through. Forecasters predict that smoke concentrations could become even higher in some locations. Residents are advised to limit outdoor activity if air quality deteriorates significantly.