An orangutan (Pongo pygmaeus) is in a pre-release location on Kaja Island, Sei Gohong, Palangka Raya, Central Kalimantan, Thursday, September 19, 2019. More than thirty orangutans in Central Kalimantan, Indonesia, are suffering from respiratory problems caused by smoke from forest fires. ANTARA FOTO/Hafidz Mubarak A

Orangutans (Pongo pygmaeus) is in a pre-release location on Kaja Island, Sei Gohong, Palangka Raya, Central Kalimantan, Thursday, September 19, 2019. Dozens of orangutans in Indonesia are suffering from respiratory problems caused by smoke from forest fires and veterinarian Fiet Hayu says the infections are being detected in the animals by symptoms of sneezing, coughing and the flu. ANTARA FOTO/Hafidz Mubarak A

An orangutan (Pongo pygmaeus) is in a pre-release location on Kaja Island, Sei Gohong, Palangka Raya, Central Kalimantan, Thursday, September 19, 2019. More than thirty orangutans in Kalimantan were being treated at a rehabilitation centre suffering from respiratory issues triggered by smokey forest fires in Indonesia. ANTARA FOTO/Hafidz Mubarak A

An orangutan (Pongo pygmaeus) is in a pre-release location on Kaja Island, Sei Gohong, Palangka Raya, Central Kalimantan, Thursday, September 19, 2019. Officials from the Borneo Orangutan Survival Foundation (BOSF) reported that 37 orangutans were suffering from various breathing related ailments and were being treated with nebulisers and antibiotics. ANTARA FOTO/Hafidz Mubarak A

An orangutan (Pongo pygmaeus) is in a pre-release location on Kaja Island, Sei Gohong, Palangka Raya, Central Kalimantan, Thursday, September 19, 2019. A total of 37 orangutans are being treated at the BOS Foundation (Borneo Orangutan Survival) rehabilitation center in Nyaru Menteng, Palangka Raya, infected with respiratory tract due to inhaling haze from forest and land fires. ANTARA FOTO/Hafidz Mubarak A

Orangutans (Pongo pygmaeus) is in a pre-release location on Kaja Island, Sei Gohong, Palangka Raya, Central Kalimantan, Thursday, September 19, 2019. A total of 37 orangutans are being treated at the BOS Foundation (Borneo Orangutan Survival) rehabilitation center in Nyaru Menteng, Palangka Raya, infected with respiratory tract due to inhaling haze from forest and land fires.ANTARA FOTO/Hafidz Mubarak A