Around the region, flights have been grounded, schools have been closed, and tens of thousands of people have sought medical treatment for respiratory problems, allergies, eczema and other ailments. The first night of an international sports competition, the FINA Swimming World Cup, set for last Saturday and hosted by Singapore, was canceled because of health concerns — as was a marathon in Kuala Lumpur, the Malaysia capital, set to be run the next morning. Read more
