Morning Briefing

"Cities in Iran, India, Pakistan and the capital of Mongolia rank among the worst on the planet for air pollution, while those in the United States and Canada are among the best, according to the first global survey released Monday by the World Health Organization," the Associated Press/San Francisco Chronicle reports. "The list, which relies on country-reported data over the past several years, measures the levels of airborne particles smaller than 10 micrometers -- so-called PM10s -- for almost 1,100 cities," the news service writes (9/27).