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Smoke from Canadian wildfires is spreading across the United States. The haze has pushed air quality into hazardous levels for millions of people. Measurements on Thursday showed Smoke from Canadian wildfires is spreading across the United States. The haze has pushed
air quality into hazardous levels for millions of people. Measurements on Thursday showed extremely high pollution indexes in several Upper Midwest cities. The elevated readings indicate dangerous concentrations of particulate matter. Forecasts suggest the smoke will
begin to clear in the Eastern states this weekend. However, the Upper Midwest is expected to continue experiencing poor air quality. Residents in affected areas are advised to limit outdoor activities. Health officials recommend using masks and monitoring local air
quality reports.