Air quality advisories were in effect for 110 million people in the United States on Wednesday morning, ranging from New Hampshire to South Carolina and covering the Northeast, including Boston, New York City and Philadelphia.
In the Northeast, the poor air quality is the result of wildfires raging in eastern Canada, sending smoke wafting into the U.S. In some areas, the smoke is so dense that people can smell it and the skies appear hazy. About 90 million people in the U.S. are impacted by the smoke.
