[Singapore's air pollution levels rank highest in the world, haze causes school closures in Malaysia] October 7th: Days before the opening weekend of Singapore's annual Formula One (F1) race, haze caused by Indonesian wildfires enveloped the region, and Singapore's air pollution levels worsened to the highest level in the world. Singapore's air quality levels were in the "very unhealthy" range as of Wednesday afternoon, according to IQAir. Neighboring city Kuala Lumpur is now ranked second among the world's most polluted cities, having previously topped the list. According to local media reports, about 200 schools, kindergartens and nurseries in the Batu Pahat area of ​​Johor, Malaysia, about 140 kilometers northwest of Singapore, were ordered to close today due to haze weather. Singapore's National Environment Agency said in its latest outlook that dry weather is expected to persist in much of southern Southeast Asia in the coming days, and the risk of fires and cross-border haze will remain high. The agency's data also showed unhealthy levels of air quality in all five areas of the city.