Indonesia Wildfire Haze Crisis Spreads Across Southeast Asia in October 2026
Hazardous haze from widespread wildfires in Indonesia is spreading across Southeast Asia, raising serious concerns about public health, air quality, transportation and regional cooperation. The fires, which have continued for months across parts of Sumatra and Borneo, have affected communities in Indonesia and neighbouring countries, including Malaysia and Singapore, as unusually hot and dry conditions have allowed vegetation and peatland fires to persist.
The crisis intensified in October, with pollution levels rising in several locations and respiratory illnesses increasing in affected Indonesian provinces. Schools have been forced to close in some areas, while aviation operations have faced disruption. The situation has also created diplomatic pressure on Jakarta, as neighbouring governments question whether Indonesia is doing enough to control the fires and address the pollution crossing national borders.
The scale of the problem has become increasingly difficult to ignore. Environmental groups estimate that hundreds of thousands of hectares of land have been damaged by fires since the beginning of 2026. Meanwhile, air-quality monitoring has recorded exceptionally high pollution levels in parts of Sumatra and Borneo, where smoke from burning forests and peatlands has accumulated over populated areas.
The haze is not confined to the locations where the fires began. Smoke can travel considerable distances depending on wind direction, atmospheric conditions and the intensity of burning. This allows pollution generated in Indonesia to affect communities across maritime Southeast Asia, creating a regional environmental problem that cannot be resolved through action in a single city or province.
Indonesia’s dry season usually runs from around April to October, making this period particularly vulnerable to forest and land fires. However, conditions have been unusually severe this year. Strong El Niño-related warming and dryness have contributed to the rapid spread of fires, while prolonged dry weather has made it harder for emergency teams to contain some of the affected areas.
Forests and peatlands are particularly important to the crisis. Peatlands contain large quantities of partially decomposed organic material accumulated over long periods. When these areas dry out, fires can spread through vegetation and smoulder beneath the surface, making them difficult to detect and extinguish completely.
A fire that appears to have been controlled at ground level can continue burning underground and re-emerge when conditions remain dry. This creates additional challenges for firefighters, who must locate hidden sources of heat and prevent flames from spreading into surrounding vegetation.
The damage is not limited to trees and visible vegetation. Peatland fires release smoke and substantial quantities of greenhouse gases, while the loss of forest cover threatens habitats and weakens ecosystems that store carbon and regulate water. When fires recur in the same areas, the landscape can become increasingly vulnerable to future burning.
The latest available estimates show a wide range in the amount of land affected. Indonesian official figures cited in recent reporting had recorded approximately 202,000 hectares burned by July. Environmental organisation Auriga reported that more than 637,000 hectares had been affected between January and August, while deforestation-monitoring group Nusantara Atlas placed the figure close to 900,000 hectares.
These estimates should not be treated as identical measurements. They cover different reporting periods and come from different monitoring methods. Nevertheless, they indicate that the fires have affected an extensive area and that the scale of the crisis remains a major concern.
The effects on human health are becoming more visible. Smoke from vegetation fires contains fine particles that can penetrate deep into the respiratory system. Exposure can irritate the eyes, nose and throat and worsen existing breathing problems. People with asthma or other respiratory conditions may be especially vulnerable, while children, older adults and outdoor workers can face additional risks.
Fine particulate pollution is particularly concerning because the smallest particles can travel deep into the lungs. When exposure continues over several days, people may experience persistent coughing, breathing discomfort and other symptoms. Smoke can also affect people who live far from the original fires, depending on how pollution moves through the atmosphere.
Indonesia’s Health Ministry reported that respiratory illnesses linked to the fires had reached 283,270 cases across seven provinces by October 13. That was more than double the 113,336 cases reported as of September 9. The figures demonstrate the growing pressure on local health services, although the precise effects can vary across communities and individuals.
Singapore has also experienced worsening air quality. The country’s one-hour PM2.5 reading reached 284 micrograms per cubic metre in the western part of the island on Wednesday, October 14, entering the National Environment Agency’s very high category for the first time this year.
PM2.5 refers to airborne particles measuring 2.5 micrometres or less in diameter. Because these particles are extremely small, they can remain suspended in the air and be inhaled deeply into the lungs. Monitoring agencies use PM2.5 measurements alongside other indicators to assess pollution and communicate health risks.
The figures reported in Singapore represent a specific monitoring location and time period, rather than a uniform reading across the entire country. Air quality can change quickly depending on wind direction, local weather and the movement of smoke. Residents therefore need to follow current guidance from their own environmental and public-health authorities.
Malaysia has also experienced significant haze, adding to concern across the region. When smoke crosses national borders, governments face the challenge of protecting residents from pollution generated elsewhere while coordinating with the country where the fires are burning.
For communities affected by the haze, the consequences extend beyond discomfort. Poor air quality can interfere with school attendance, outdoor work, tourism and ordinary daily activities. Employers may need to adjust working arrangements, while families can face additional costs when they seek cleaner indoor environments or medical care.
Schools in parts of Indonesia, neighbouring East Timor and several Malaysian states have been forced to close because of the conditions. Such closures can interrupt lessons and create difficulties for parents who must arrange alternative childcare or remain home with children.
Aviation has also been affected. Nearly 2,000 flights in Indonesia were reported to have experienced disruption between August 11 and October 12. Smoke and reduced visibility can complicate airport operations, although the precise reason for each affected flight may differ. Delays and cancellations can disrupt travel plans, cargo movements and connections for passengers travelling through regional airports.
Airlines and airport operators must consider visibility, weather conditions, operational requirements and safety assessments before deciding whether flights can proceed. Even when airports remain open, changing conditions may lead to delays or schedule adjustments that affect passengers and businesses.
The economic impact can spread into sectors that depend on predictable travel and outdoor activity. Tourism businesses may experience fewer visitors when haze becomes severe, while transport operators and local retailers can face reduced demand. Agriculture can also suffer when fires damage land or disrupt normal farming activity.
For governments, the emergency creates additional costs associated with firefighting, public-health responses, monitoring and restoring damaged land. The longer fires continue, the greater the pressure on emergency services and local budgets. Businesses may also face losses when operations are interrupted or workers cannot safely perform their usual duties.
The crisis has renewed scrutiny of Indonesia’s land-management policies. Fires can start through several routes, including accidental ignition, deliberate land clearing and the spread of flames from existing burned areas. Dry conditions make these incidents more difficult to control, but weather alone does not explain every fire.
Land clearing practices have been a long-standing concern in parts of Indonesia. Burning vegetation can be used to prepare land for agriculture, but uncontrolled fires may spread beyond the intended area, especially when soil and vegetation are extremely dry. The expansion of agricultural activity, including palm oil production, has also raised questions about forest loss, drainage and the management of peatland ecosystems.
Draining peatlands can lower the water table and leave organic material more exposed to ignition. Once peat dries, a fire may continue underground and become difficult to extinguish with conventional methods. Protecting and restoring these ecosystems is therefore an important part of reducing the risk of future fires.
Indonesian authorities say they are deploying substantial resources to contain the emergency. More than 60,000 personnel have been mobilised, while approximately 50 aircraft have been used for water bombing and cloud-seeding operations. The government has also announced plans to increase the number of forest rangers and restore peatland ecosystems.
Police officials have said that 223 individuals and nine companies could face action over alleged involvement in starting forest fires. These are potential enforcement actions, not proof that every person or company identified has been found guilty. Investigations and legal proceedings must establish responsibility in individual cases.
The authorities have also restricted the use of fire for land clearing and stated that action is being taken against businesses that break the law. However, the continuing spread of fires has raised questions about enforcement, prevention and whether sufficient resources are reaching the most affected areas.
Regional tensions have increased because Malaysia and Singapore have offered assistance that Indonesia has not yet accepted, according to reporting on October 15. Jakarta has also faced criticism over its reluctance to declare a national disaster, a decision that could affect the mobilisation and coordination of emergency resources.
Indonesia’s response involves difficult operational and political considerations. A large-scale emergency can require coordination between national agencies, provincial authorities, local communities and private landholders. Accepting external assistance may help expand firefighting capacity, but the deployment of personnel and equipment requires clear arrangements concerning responsibility, access and coordination.
The cross-border effects make cooperation especially important. Smoke does not respect national boundaries, and a government cannot fully protect its residents if pollution from neighbouring territory remains severe. Shared monitoring, timely warnings, coordinated firefighting support and clear communication can help governments respond more effectively.
The Association of Southeast Asian Nations has long recognised transboundary haze as a regional concern. The latest crisis renews the importance of practical cooperation, particularly when severe weather makes fires more difficult to control. Governments can exchange information about hotspots, coordinate emergency support and work on longer-term measures to prevent burning.
However, lasting progress requires more than emergency aircraft and temporary closures. Fire prevention depends on enforcement, land management, early detection, peatland protection and support for communities that rely on agriculture. Businesses operating in forested areas also have a role in preventing fires and ensuring that land-clearing activities comply with environmental rules.
Weather conditions will remain an important factor in determining how quickly the situation improves. Indonesian authorities have said that sustained rainfall is needed to help bring the fires under control. The rainy season usually begins around October in many areas, but forecasts indicate that more consistent rainfall may be delayed until November this year.
The effects of El Niño-related conditions are expected to continue into the first quarter of 2027, according to Indonesia’s weather agency. Rainfall could help reduce the immediate danger, but its impact will depend on where and how consistently it occurs. A brief shower may not extinguish peat fires burning underground, while prolonged rain can make firefighting and access to remote areas more difficult in other ways.
Even after visible flames decline, the consequences may continue. Damaged forests and peatlands can take years to recover, while communities may need time to address health problems, repair property and restore disrupted livelihoods. Smoke can also return if hidden fires reignite during another dry period.
For residents, the immediate priority is to follow local air-quality warnings and public-health advice. Authorities may recommend reducing strenuous outdoor activity, keeping indoor air as clean as possible and using suitable protection when exposure cannot be avoided. People who experience serious breathing difficulties should seek medical attention rather than assume the symptoms will disappear when the haze lifts.
The wider lesson is that Indonesia’s wildfire emergency is both an environmental and a regional policy challenge. Extreme dryness has intensified the danger, but land management, prevention and enforcement influence how much damage fires ultimately cause. Neighbouring countries can assist with monitoring and emergency response, yet long-term improvements depend on sustained action within Indonesia as well as regional cooperation.
The coming weeks will be critical. If sustained rainfall arrives and firefighting operations contain the remaining hotspots, air quality could improve. If dry conditions persist, fires may continue to generate pollution and place additional pressure on hospitals, schools, airports and local economies.
For now, the spread of hazardous haze across Southeast Asia is a warning of how quickly a national environmental crisis can become a regional emergency. The rising number of respiratory cases, extensive land damage and disruption to travel show why fire prevention and rapid response must remain priorities long after the immediate smoke begins to clear.
