An aerial night view of the Singapore downtown with parts of the Singapore Grand Prix's Marina Bay City Circuit seen from the Swissotel The Stamford hotel in Singapore, Monday, Sept. 14, 2015. Billowing smog from Indonesian forest fires worsened Singapore air pollution levels on Monday, causing caution to set in as schools reopened after the September holidays and organizers counted down to a widely-anticipated Formula One night race. (AP Photo/Ng Han Guan)
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