Singapore’s air pollution worst in world as haze shuts Malaysia schools

Singapore’s air pollution worsened to the highest in the world as haze from Indonesia wildfires blankets the region days before the city state’s annual Formula One weekend. Air quality levels in Singapore were in the “very unhealthy” range as of Wednesday afternoon, according to data from IQAir. Nearby Kuala Lumpur, which was earlier in the top spot, ranked as the second-most polluted city globally. In the Malaysian state of Johor, about 140km (87 miles) northwest of Singapore, some 200 schools,...