National air quality index map: AQI remains unhealthy in parts of eastern United States
Polluted air will remain a threat Friday for millions of Americans across the eastern United States as the Canadian wildfires continue to send smoke billowing across the region, tinging the skies with a hazy − sometimes orange − glow.
With air quality alerts still in place, residents from Michigan, Ohio, the Northeast and the Mid-Atlantic are still being advised to remain indoors as much as possible. In some cases, people are advised to wear masks to filter out harmful particles that make the air unsafe to breathe.
Experts are warning that the weather pattern that's bringing the Canadian smoke into the eastern U.S. is only the beginning as Canadian wildfires become more rampant. While the weather pattern isn't unusual, meteorologists say what's notable is the volume of smoke being produced due to the historic number of fires.
Photos: Surreal photos show NYC covered in glowing orange haze from Canada wildfire smoke
Experts: Smoke and haze stunned the East Coast this week. Get used to it, experts warn.
National air quality index map
Eric Lagatta covers breaking and trending news for USA TODAY. Reach him at elagatta@gannett.com and follow him on Twitter @EricLagatta.
This article originally appeared on USA TODAY: National AQI map: What is the air quality index across the US?
