PolisPolusi asap disebabkan oleh pembakaran lahan pertanian Indonesia di [[Sumatra]] dan [[Kalimantan]],<ref>{{cite web|url=https://www.straitstimes.com/asia/se-asia/indonesia-steps-up-fight-against-fires-as-hot-spots-increase|title=Indonesia steps up fight against fires as hot spots increase|author=Linda Yulisman|publisher=The Straits Times|date=14 August 2019|accessdate=23 August 2019}}</ref> serta kebakaran hutan di negara bagian [[Sarawak]] yang terletak di Malaysia,<ref name="Sarawak forest fires">{{cite web|url=https://www.thestar.com.my/news/nation/2019/07/17/forest-fires-flare-up-again-in-parts-of-sarawak|title=Forest fires flare up again in parts of Sarawak|author=Stephen Then|publisher=The Star|date=17 July 2019|accessdate=23 August 2019}}</ref> [[Distrik Brunei-Muara]] yang terletak di [[Brunei]],<ref name="Brunei forest fires">{{cite web|url=https://thescoop.co/2019/03/22/bomba-161-hectares-of-forest-destroyed-by-fire-in-past-week/|title=Bomba: 161 hectares of forest destroyed by fire in past week|author=Rasidah Hj Abu Bakar|publisher=The Scoop|date=22 March 2019|accessdate=23 August 2019}}</ref> Taman Pantai Timur di [[Singapura]],<ref name="East Coast Park fire">{{cite web|url=https://www.todayonline.com/singapore/vegetation-fire-size-2-football-fields-breaks-out-near-east-coast-park|title=Vegetation fire the size of 2 football fields breaks out near East Coast Park|publisher=Today Online|date=13 August 2019|accessdate=23 August 2019}}</ref> dan perladangan hutan di utara Thailand dengan lahan-lahan pertanian di Pa Phru Kuan Kreng, [[Provinsi Nakhon Si Thammarat]], selatan Thailand.<ref name="northern Thailand forest fires">{{cite web|url=https://www.straitstimes.com/asia/se-asia/north-chokes-on-toxic-haze-largely-from-myanmar-fires|title=Thailand's North choking on toxic haze from fires|publisher=The Straits Times|date=12 March 2019|accessdate=23 August 2019}}</ref><ref name="southern Thailand forest and farm fire">{{cite web|url=http://www.khaosodenglish.com/featured/2019/08/22/weeks-of-fire-destroyed-almost-14500-rai-of-forest-and-farms-in-southern-thailand/|title=Weeks of Fire Destroyed Almost 14,500 Rai of Forest and Farms in Southern Thailand|author=Asaree Thaitrakulpanich|publisher=Khaosod English|date=22 August 2019|accessdate=23 August 2019}}</ref>
