Lee Hsien Loong

People wearing masks walk past a Louis Vuitton shop display in Singapore's Orchard Road shopping district...People wearing masks walk past a Louis Vuitton shop display in Singapore's Orchard Road shopping district June 21, 2013. The haze blanketing Singapore from fires in Indonesia could persist for weeks or even longer, Prime Minister Lee Hsien Loong said on Thursday, warning of consequences if Singapore-linked companies were found responsible for the burning.  REUTERS/Edgar Su (SINGAPORE - Tags: ENVIRONMENT HEALTH TPX IMAGES OF THE DAY)

Edgar Su/Reuters

People wearing masks walk past a Louis Vuitton shop display on Orchard Road, Singapore on Friday. Read more

Children cover their noses near burnt land in Marpoyan Damai sub district, in the outskirts of Pekanbaru, in Indonesia's Riau province June 20, 2013. Haze from fires in Indonesia blanketing Singapore could persist for weeks or longer, Singapore's Prime Minister Lee Hsien Loong said on Thursday, as the smoke drove air quality to "hazardous" levels and disrupted business and travel in the region.

Azwar/Reuters

Children cover their noses near burnt land in Marpoyan Damai sub district, in the outskirts of Pekanbaru, in Indonesia’s Riau province. Haze from fires in Indonesia blanketing Singapore could persist for weeks or longer, Singapore Prime Minister Lee Hsien Loong said on Thursday, as the smoke drove air quality to “hazardous” levels and disrupted business and travel in the region.