A few days before the opening of Singapore's annual Formula 1 weekend, smog from Indonesia's wildfires engulfed the region, and Singapore's air pollution level worsened to the highest level in the world. As of Wednesday afternoon, Singapore's air quality levels were in a “very unhealthy” range, according to IQAir. Neighboring Kuala Lumpur currently ranks second among the world's most polluted cities, and previously topped the list. According to local media reports, about 200 schools, kindergartens and nurseries in the Batu Pahat region of Johor, Malaysia, about 140 kilometers northwest of Singapore, were ordered to close classes today due to smog and haze.

A few days before the opening of Singapore's annual Formula 1 weekend, smog from Indonesia's wildfires engulfed the region, and Singapore's air pollution level worsened to the highest level in the world. As of Wednesday afternoon, Singapore's air quality levels were in a “very unhealthy” range, according to IQAir. Neighboring Kuala Lumpur currently ranks second among the world's most polluted cities, and previously topped the list. According to local media reports, about 200 schools, kindergartens and nurseries in the Batu Pahat region of Johor, Malaysia, about 140 kilometers northwest of Singapore, were ordered to close classes today due to smog and haze.