Last week, among the thousands of urban areas in 85 countries around the world, Edmonton had the worst air quality in cities with more than 250,000 people. According to Berkeley Earth's air quality data, Edmonton beat out cities in India, China and the Middle East, places where cities with poor air quality usually top the list. "The air quality in Edmonton was clearly unhealthy," Robert Rohde, the lead scientist at Berkeley Earth, told CBC's Radio Active. But in Edmonton, as in most North American cities, the primary cause of poor air quality is wildfire smoke, he said. Some people have mentioned that Prince George, Canada has had even worse air quality than Edmonton.

Source: CBC News August 20, 2018 23:03 UTC