08:42 UTC+8, 2023-06-29        Millions of Americans are on alert for unhealthy air quality as wildfire smoke from Canada continues to drift to the United States.   08:42 UTC+8, 2023-06-29        Reuters Hazy sky is seen from the smoke of the raging Canadian wildfires, hanging over the US Midwest and parts of the East Coast, in Pittsburgh, Pennsylvania, US, on June 28, 2023. Millions of Americans are on alert for unhealthy air quality as wildfire smoke from Canada continues to drift to the United States.

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