Air Quality in Singapore, Kuala Lumpur and Jakarta Worst in the World

A man wears a face mask in front of the haze shrouded Marina Bay Sands hotel and casino in Singapore.

Photographer: Dimas Ardian/Bloomberg
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The air quality level in Singapore turned unhealthy ahead of the Formula 1 race this weekend, while Kuala Lumpur was ranked among the world’s most polluted cities, as wind from neighboring Indonesia continued to sweep in ash and smoke from illegal burning of forests and farm land.

Authorities canceled schools for nearly one in seven Malaysian children as the haze worsened across the country, while dozens of flights in Southeast Asia were delayed or canceled because of poor visibility at airports.