The National Weather Service has issued an air quality warning Friday for most of northern Maine due to drifting Canadian wildfire smoke.

According to weather forecasters, smoke will linger over parts of Maine north of Dover-Foxcroft, Lincoln and Topsham through Friday evening. The amount of particle pollution is unhealthy for “sensitive groups,” which includes people with heart or lung disease, the elderly, teenagers and children.

People in these groups should be careful about doing strenuous exercise outdoors.

A moderate amount of particle pollution is expected to linger over the entirety of the state Friday.

Moderate particle pollution will persist across the entire state on Saturday, according to the Maine Department of Environmental Protection.

The lingering smoke coincides with

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