Wildfire smoke casts yellow haze over Boston, more expected Wednesday

What's happening: More than 800 fires are burning across Canada, including some near the Minnesota border.

• Winds carried the plumes over 1,000 miles into New England.

Between the lines: Most of the smoke is trapped high in the atmosphere, so ground-level air quality has stayed largely unaffected.

• There can be a faint smoky smell and hazier conditions from time to time.

What's next: Models point to even heavier smoke Wednesday, with poor air quality likely for sensitive groups and more yellow skies.

Yes, but: Vibrant sunsets are expected as smoke particles scatter blue light and let red and orange tones through.

What's next: Most of the smoke should push south by Thursday.