A crew member of a helicopter operated by Indonesia's Disaster Mitigation Agency checks a water-bombing operation in Pelalawan, Indonesia, on Thursday, September 17. <a href="index.php?page=&url=http%3A%2F%2Fwww.cnn.com%2F2015%2F09%2F17%2Fasia%2Findonesian-haze-southeast-asia-pollution%2Findex.html" target="_blank">Choking smog</a> across Indonesia, Singapore and Malaysia can be linked to the burning of farmland that takes place every year for paper, pulp and palm oil production.
A crew member of a helicopter operated by Indonesia's Disaster Mitigation Agency checks a water-bombing operation in Pelalawan, Indonesia, on Thursday, September 17. Choking smog across Indonesia, Singapore and Malaysia can be linked to the burning of farmland that takes place every year for paper, pulp and palm oil production.
Adek BerryAFP/Getty Images
An aerial view from a helicopter shows fires burning in Pelalawan on September 17. The smog has become so bad this year that the Indonesian government has declared a state of emergency in Riau province.
An aerial view from a helicopter shows fires burning in Pelalawan on September 17. The smog has become so bad this year that the Indonesian government has declared a state of emergency in Riau province.
Adek BerryAFP/Getty Images
A firefighter combats a blaze in Ogan Komering Ilir, Indonesia, on Saturday, September 12.
A firefighter combats a blaze in Ogan Komering Ilir, Indonesia, on Saturday, September 12.
Abdul Qodira/AFP/Getty Images
A firefighter washes his face in Kampar, Indonesia, on September 12.
A firefighter washes his face in Kampar, Indonesia, on September 12.
Adek BerryAFP/Getty Images
Firefighters work in Kampar on Sunday, September 13.
Firefighters work in Kampar on Sunday, September 13.
Adek BerryAFP/Getty Images
Members of the Indonesian Air Force attend a roll call at an airport before reinforcing firefighters in Pekanbaru, Indonesia, on Tuesday, September 15.
Members of the Indonesian Air Force attend a roll call at an airport before reinforcing firefighters in Pekanbaru, Indonesia, on Tuesday, September 15.
Adek BerryAFP/Getty Images
Workers load palm-oil seeds into the back of a truck at a plantation area in Pelalawan on Wednesday, September 16. For 18 years, plantations have farmed the rich peatlands that run along the Sumatran coast of Indonesia and Borneo Island.
Workers load palm-oil seeds into the back of a truck at a plantation area in Pelalawan on Wednesday, September 16. For 18 years, plantations have farmed the rich peatlands that run along the Sumatran coast of Indonesia and Borneo Island.
Adek BerryAFP/Getty Images
A worker stands on palm-oil seeds in the back of a truck at a plantation area in Pelalawan on September 16.
A worker stands on palm-oil seeds in the back of a truck at a plantation area in Pelalawan on September 16.
Adek BerryAFP/Getty Images
Students cross a river under a blanket of haze September 17 in Palembang, Indonesia.
Students cross a river under a blanket of haze September 17 in Palembang, Indonesia.
Abdul Qodira/AFP/Getty Images
A woman wears a mask as haze shrouds the Petronas Twin Towers in Kuala Lumpur, Malaysia, on Friday, September 11.
A woman wears a mask as haze shrouds the Petronas Twin Towers in Kuala Lumpur, Malaysia, on Friday, September 11.
Mohd Rasfan/AFP/Getty Images
People in Pekanbaru wear masks during prayers on September 15.
People in Pekanbaru wear masks during prayers on September 15.
Adek BerryAFP/Getty Images
Pedestrians wear face masks in Kuala Lumpur on September 11.
Pedestrians wear face masks in Kuala Lumpur on September 11.
Mohd Rasfan/AFP/Getty Images
Motorists drive on a street in Karak, Malaysia, on September 15.
Motorists drive on a street in Karak, Malaysia, on September 15.
Mohd Rasfan/AFP/Getty Images
Thick haze shrouds Kuala Lumpur on September 11.
Thick haze shrouds Kuala Lumpur on September 11.
Mohd Rasfan/AFP/Getty Images