Скачать или смотреть Air quality in US impacted by Canadian wildfire smoke. What to know. | JUST THE FAQS

Here's why Canadian wildfire smoke is impacting air quality in U.S. cities.

RELATED: Wildfire smoke brings eerie skies, dangerous air to northeastern US https://tinyurl.com/y4433328

Smoke from wildfires raging in Canada engulfed more U.S. cities on Thursday − from the Midwest to the Northeast to the mid-Atlantic to the Southeast − leading to perilous air quality for millions and prompting warnings to limit outdoor time.

The unhealthy air shifted slightly south since Wednesday, and more parts of the country are being affected, National Weather Service meteorologist Bryan Jackson told USA TODAY. The federal government tracks and publishes searchable realtime results.

"Some places are having a repeat of yesterday, some are worse than yesterday," Jackson said, adding that the smoke moved into cities like Pittsburgh and Washington, D.C., starting Wednesday afternoon. The Canadian wildfires have burned a larger area than the state of Maine.

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