Smoke from 150-plus wildfires in Canada could affect air quality and cause health problems for Americans. Is Ohio in the path? What to know.

According to forecasters at AccuWeather, cities where smoke is expected to become thick enough to be noticeable include Fargo, North Dakota; Minneapolis and Duluth, Minnesota; Green Bay and Milwaukee; and Chicago, Illinois. Additionally, high-altitude wildfire smoke may be visible as far southeast as Detroit and Indianapolis.

Lingering wildfire smoke will become thicker in Wisconsin overnight, making it difficult to get a view of possible northern lights.

Wildfire smoke returns to Wisconsin skies with air quality concerns for Tuesday. Temperatures climbing into the 80s before thunderstorms arrive midweek.

Blazes in the provinces of Manitoba and Saskatchewan have forced thousands to evacuate. Smoke is expected to waft over the U.S. through the weekend.

Exposure to wildfire smoke may increase lung cancer patients' risk of dying from their disease, particularly among non-smokers, but the effect may be mitigated by certain cancer treatments, according to a large California study presented at a major medical meeting on Saturday.

Most folks will see low to mid-40s for lows on Sunday with highs in the mid-60s by Sunday afternoon. A stray is possible during the midday to early afternoon hours in our northeast counties; otherwise, expect a partly cloudy sky and continued steady breeze out of the west around 10-15mph.

By Dennis Thompson HealthDay ReporterFRIDAY, May 30, 2025 (HealthDay News) — Skies choked with wildfire smoke can affect people’s heart and lung health for up to three months afterwards, a new study says.