Canadian wildfire smoke reaches major U.S. cities

Plumes of smoke generated by several large wildfires in western Canada have drifted southward, reaching major U.S. metropolitan areas including Seattle, Portland, and the San Francisco Bay region. The fires, which have been burning for weeks across British Columbia and Alberta, are fueled by dry conditions and high temperatures, prompting evacuation orders for thousands of residents and prompting firefighting agencies to deploy aerial and ground resources. Satellite imagery shows dense smoke columns rising up to 30,000 feet, while wind patterns have carried the particulate matter across the border, prompting air quality alerts in multiple states.

Air quality monitoring stations in the affected cities have recorded particulate matter (PM2.5) concentrations exceeding health‑based thresholds, leading public health officials to advise residents, especially those with respiratory conditions, to limit outdoor activities and keep windows closed. State and local agencies have activated emergency response plans, distributing masks and providing real‑time updates through digital platforms. As fire suppression efforts continue and weather forecasts predict a temporary shift in wind direction, officials anticipate a gradual improvement in air quality over the coming days, though they warn that lingering smoke may persist.