Vietnam's capital blanketed by toxic smog

Authorities urged people to wear masks and limit time outdoors, but commuters told AFP they were struggling to breathe through the putrid smog, now a fixture of the winter months in the city. According to IQAir, levels of PM2.5 pollutants -- cancer-causing microparticles small enough to enter the bloodstream through the lungs -- hit 227 micrograms per cubic metre, 15 times the World Health Organization's recommended maximum daily average exposure. Hanoi topped the Swiss monitoring company's ranking...