The U.S. is nowhere near out of the woods from the dangers of smoke billowing from hundreds of wildfires burning throughout Canada. A grayish haze continued to linger over much of the Northeast on Monday, nearly a week after the air quality emergency in the region began to confine millions of people indoors. Philadelphia’s Air Quality Index measured at 101 on Monday morning, or “Code Orange,” which is unhealthy for sensitive groups such as young children, the elderly, pregnant women and those with pre-existing lung and heart conditions, according to AirNow.gov.
