A woman wears a mask as the Singapore Central Business District is covered with haze Thursday evening, June 20, 2013. Singapore urged people to remain indoors amid unprecedented levels of air pollution Thursday as a smoky haze wrought by forest fires in neighboring Indonesia worsened dramatically. <AP Photo/NEWSis/Joseph Nair>
Cars travel on an expressway in Singapore as buildings in the background are obscured by haze on Thursday, June 20, 2013. <AP Photo/NEWSis/Joseph Nair>
