As wildfires continue to spread through the prairies of Canada, smoke is traveling down into central and eastern United States, including New Hampshire and Maine.

While the smoke may cloud your vision of the sky or ruin a day at the beach on this week's warmest days of the season so far, it is more than just a nuisance. All across the U.S., the smoke is causing poor air quality, which can cause health effects from mild symptoms in the healthy to dangerous risks for sensitive groups.

An air quality warning has been issued for Portsmouth by the New Hampshire Department of Environmental Services.

Here's what to know about the wildfire smoke and its effects in New Hampshire and Maine.

Where is the Canadian wildfire smoke in the U.S.?

How long will the smoke last in NH and ME?

In Maine, s

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