Thick air pollution has been choking parts of Indonesia, Singapore and Malaysia for weeks. People are silhouetted against Singapore's popular tourist destination, Sentosa, seen through the haze on September 24, 2015.
Thick air pollution has been choking parts of Indonesia, Singapore and Malaysia for weeks. People are silhouetted against Singapore's popular tourist destination, Sentosa, seen through the haze on September 24, 2015.
AP Photo/Wong Maye-E
The Fullerton Hotel, a Singapore landmark, is blanketed in thick smog on September 24.
The Fullerton Hotel, a Singapore landmark, is blanketed in thick smog on September 24.
ROSLAN RAHMAN/AFP/Getty Images
Indonesians cover their mouths and noses from the pollution as they travel to attend a morning prayer celebrating Eid al-Adha, or the "Festival of Sacrifice," in Palembang, South Sumatra on September 24.
Indonesians cover their mouths and noses from the pollution as they travel to attend a morning prayer celebrating Eid al-Adha, or the "Festival of Sacrifice," in Palembang, South Sumatra on September 24.
AP Photo
Buildings along Singapore's Shenton Way business district are obscured by thick smog on September 24.
Buildings along Singapore's Shenton Way business district are obscured by thick smog on September 24.
ROSLAN RAHMAN/AFP/Getty Images
A crew member of a helicopter operated by Indonesia's Disaster Mitigation Agency checks a water-bombing operation in Pelalawan, Riau, Indonesia, on September 17, 2015.
A crew member of a helicopter operated by Indonesia's Disaster Mitigation Agency checks a water-bombing operation in Pelalawan, Riau, Indonesia, on September 17, 2015.
Adek BerryAFP/Getty Images
Students commute to school on boats while haze from agricultural and forest fires blankets the Ogan River in Palembang, South Sumatra, Indonesia on September 15, 2015. The thick haze caused by fires from illegal land clearing on Indonesia's Sumatra and Borneo islands spreads over to Singapore and Malaysia.
Students commute to school on boats while haze from agricultural and forest fires blankets the Ogan River in Palembang, South Sumatra, Indonesia on September 15, 2015. The thick haze caused by fires from illegal land clearing on Indonesia's Sumatra and Borneo islands spreads over to Singapore and Malaysia.
AP Photo
A woman shields herself from the soupy haze with a face mask in Kuala Lumpur, Malaysia on September 15. Malaysian authorities ordered 2,045 schools in the capital and neighboring states to close on Monday after the Air Pollutant Index (API) soared to "very unhealthy" levels.
A woman shields herself from the soupy haze with a face mask in Kuala Lumpur, Malaysia on September 15. Malaysian authorities ordered 2,045 schools in the capital and neighboring states to close on Monday after the Air Pollutant Index (API) soared to "very unhealthy" levels.
MANAN VATSYAYANA/AFP/Getty Images
Malaysia's iconic Petronas Twin Towers are seen cloaked in haze in Kuala Lumpur on September 15.
Malaysia's iconic Petronas Twin Towers are seen cloaked in haze in Kuala Lumpur on September 15.
MOHD RASFAN/AFP/Getty Images
City lights pierce through the dense haze in Singapore on September 14, 2015.
City lights pierce through the dense haze in Singapore on September 14, 2015.
ROSLAN RAHMAN/AFP/Getty Images
Cars drive through a bridge over the Siak river in Riau, Indonesia, on September 13, 2015. Indonesia declared a state of emergency in Sumatra's Riau province on September 14 as air quality hit a very dangerous level with an API exceeding 900.
Cars drive through a bridge over the Siak river in Riau, Indonesia, on September 13, 2015. Indonesia declared a state of emergency in Sumatra's Riau province on September 14 as air quality hit a very dangerous level with an API exceeding 900.
ADEK BERRY/AFP/Getty Images
Burnt trees appear skeletal on a farmland after firemen managed to put out the fire in Kampar, Riau, on September 13.
Burnt trees appear skeletal on a farmland after firemen managed to put out the fire in Kampar, Riau, on September 13.
ADEK BERRY/AFP/Getty Images
A man fishes in haze-hit Port Klang, outside Kuala Lumpur, on September 13.
A man fishes in haze-hit Port Klang, outside Kuala Lumpur, on September 13.
AP Photo/File/Joshua Paul
A fireman works to contain the flames on a field in Ogan Ilir, South Sumatra, Indonesia on September 12, 2015.
A fireman works to contain the flames on a field in Ogan Ilir, South Sumatra, Indonesia on September 12, 2015.
AP Photo
A man covers his nose near Singapore's iconic Marina Bay Sands hotel on September 10, 2015.
A man covers his nose near Singapore's iconic Marina Bay Sands hotel on September 10, 2015.
AP Photo/Ng Han Guan
Firemen spray water to contain smoke-belching fires in Ogan Ilir, South Sumatra, Indonesia on September 5, 2015.
Firemen spray water to contain smoke-belching fires in Ogan Ilir, South Sumatra, Indonesia on September 5, 2015.
AP Photo