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Canadian wildfire smoke blankets Wisconsin again, levels unhealthy for sensitive groups
Canadian wildfire smoke returned to Wisconsin this weekend, with unhealthy levels for people with asthma and heart disease.
Canadian wildfires smoke blankets Midwest, forcing millions of Americans indoors
Canadian wildfire smoke causes dangerous air quality in 12 Midwest states. Health alerts urge 22 million residents to stay indoors as PM2.5 levels soar.