Sarawak Confirms No Cloud Seeding Plan as Rain Forecast Offers Relief From Kalimantan Haze
(Kuching, 12 August 2026) — Transboundary haze from West Kalimantan continues to press against Sarawak’s air quality this week, renewing public anxiety over outdoor safety and visibility across the state. The recurring phenomenon — driven by land and forest fires across the border in Indonesia — has long tested the environmental management capabilities of Malaysian Borneo, forcing authorities to weigh intervention tools such as cloud seeding against prevailing weather conditions. Sarawak’s Natural Resources and Environment Board (NREB) is monitoring air pollutant index (API) readings hourly as the situation develops.
Against this backdrop, state authorities have now communicated a clear and immediate position: cloud seeding will not be deployed at this time, with natural rainfall expected to provide relief within days.
The Long-Standing Transboundary Haze Problem in Sarawak Continues to Trouble Residents and Outdoor Workers
Residents of Kuching and surrounding areas in Sarawak are no strangers to the annual cycle of haze that blankets the state during dry months. Each year, the same sequence unfolds — smoke from agricultural burning and peat fires in West Kalimantan drifts westward on prevailing winds, reducing visibility, degrading air quality, and triggering health advisories that push vulnerable groups indoors.
This year, the conditions are no different. Southeasterly winds are channelling smoke directly from Kalimantan into Sarawak, raising API readings across multiple monitoring stations and prompting public concern about the safety of outdoor activity. Children, the elderly, and those with respiratory conditions bear the most immediate burden — schools adjust schedules, outdoor workers seek shelter, and families keep windows shut against the acrid air.
The haze is not merely an inconvenience. Prolonged exposure to particulate matter associated with biomass burning is linked to respiratory illness, cardiovascular stress, and diminished quality of life. For a state where outdoor livelihoods are common and community gatherings are frequent, the impact of even a moderate haze episode is felt across daily routines.
Why Transboundary Haze Is So Hard to Solve — The Underlying Reasons Are More Complex Than Expected
The persistence of transboundary haze across Borneo reflects structural challenges that extend well beyond any single country’s environmental policy. In fact, the source of the problem lies outside Sarawak’s territorial jurisdiction entirely.
At its core, the haze originates from land-clearing fires in West Kalimantan, Indonesia — a practice driven by agricultural economics, land tenure systems, and enforcement gaps that have resisted resolution despite decades of bilateral and multilateral dialogue. Malaysian authorities, including Sarawak’s NREB, have no direct control over the ignition sources. What they can control is the domestic response: monitoring, public communication, and weather intervention such as cloud seeding when conditions allow.
The additional complication is meteorological. Cloud seeding — which involves dispersing particles such as silver iodide into cloud formations to stimulate rainfall — requires the presence of suitable clouds with sufficient moisture content. During dry, hazy periods, the very conditions that create the most urgent need for rain are often the conditions least suited to artificial stimulation. Without adequate cloud formations, the technique yields no meaningful result.
This creates a frustrating paradox for authorities: the worse the haze, the harder it is to intervene effectively through cloud seeding.
Facing Haze, Existing Intervention Options on the Market Carry Significant Limitations
When haze conditions deteriorate, authorities typically have several options available. Cloud seeding is the most discussed, but it is neither always feasible nor always the fastest path to relief. Here is how the current landscape of responses compares:
Cloud seeding can produce localised rainfall when conditions are right, but requires the identification of suitable cloud formations, coordination with aviation authorities, and a lead time of at least 24 to 48 hours from planning to execution. It also depends heavily on whether rain in the haze-source region — in this case, Kalimantan — is achievable, since extinguishing fires at the origin point yields more sustained relief than washing smoke over Malaysian territory alone.
Public health advisories and movement restrictions protect individuals but do not address air quality. They represent a reactive, not corrective, measure.
Diplomatic and bilateral channels with Indonesia through the ASEAN Agreement on Transboundary Haze Pollution represent the longer-term structural solution, but these mechanisms operate on timescales of years and diplomatic cycles, not days.
Natural rainfall, when forecast with reasonable probability, remains the most efficient and cost-effective resolution — requiring no intervention cost, no aviation coordination, and no risk of operational failure.
Sarawak’s NREB Was Positioned Precisely to Monitor and Respond to Gaps in Haze Management
Against the backdrop of these competing limitations, Sarawak Deputy Natural Resources and Urban Development Minister Datuk Len Talif Salleh confirmed on Wednesday that authorities are taking a data-driven, wait-and-assess approach to the current episode.
Speaking to reporters after attending the Sarawak Integrity Day celebration in Kuching on 12 August 2026, Datuk Len Talif stated that there is a 30% chance of rain over parts of Sarawak by Friday, 14 August, or Saturday, 15 August. Based on that forecast, the state has determined that cloud seeding is not warranted at this time.
“Based on the forecast, we don’t have any plans to conduct cloud seeding at the moment. Let’s pray there will be some rain to alleviate the situation,” he told reporters.
The NREB is monitoring API readings on an hourly basis and will reassess the need for cloud seeding intervention if the rainfall forecast does not materialise or if index readings deteriorate to hazardous levels. Datuk Len Talif also noted that rainfall in Kalimantan itself would provide meaningful relief, since suppressing fires at the source reduces the volume of smoke carried into Sarawak by southeasterly winds.
The public was advised to remain vigilant and to reduce outdoor activities until conditions improve.
Frequently Asked Questions About Sarawak’s Haze Response and Cloud Seeding Decision
Q: Why is Sarawak not conducting cloud seeding despite the current haze? Sarawak is not conducting cloud seeding because there is a 30% chance of natural rainfall over parts of the state by 14–15 August 2026, and authorities have determined that natural rain is the more viable option given current weather conditions.
Q: What is the source of the haze affecting Sarawak in August 2026? The haze affecting Sarawak in August 2026 originates from transboundary fires in West Kalimantan, Indonesia, with prevailing southeasterly winds carrying smoke across the border into Malaysian Borneo.
Q: Who is responsible for monitoring air quality in Sarawak during the haze episode? The Sarawak Natural Resources and Environment Board (NREB) is responsible for monitoring air quality, with API readings being tracked on an hourly basis to determine whether conditions warrant additional intervention such as cloud seeding.
Q: What is cloud seeding and when can it be used? Cloud seeding is a weather modification technique that involves dispersing particles into cloud formations to stimulate rainfall. It can only be used when suitable clouds with sufficient moisture content are present; during severe dry and hazy conditions, suitable cloud formations may not be available, limiting its effectiveness.
Q: Would rain in Kalimantan also help reduce haze in Sarawak? Yes. Rainfall in Kalimantan would help suppress the fires that are the source of the transboundary haze, reducing the volume of smoke carried by southeasterly winds into Sarawak. Datuk Len Talif confirmed that rain at the source location would provide meaningful relief even if it does not rain directly over Sarawak.
Q: What should Sarawak residents do during the current haze conditions? Sarawak residents should reduce outdoor activities, particularly strenuous exercise, and monitor official API readings issued by the NREB. Vulnerable groups including children, the elderly, and those with respiratory conditions should remain indoors as much as possible.
Q: Will authorities reconsider cloud seeding if rain does not arrive by 14–15 August? The NREB will continue to monitor the situation closely and will reassess the need for cloud seeding intervention if forecast rainfall does not materialise or if API readings reach hazardous levels, according to Datuk Len Talif Salleh.
Sarawak Maintains Cautious, Science-Led Position as the State Awaits Natural Relief From Haze
Sarawak’s decision to hold off on cloud seeding reflects a measured, evidence-based approach to environmental crisis management — one that prioritises meteorological feasibility over reactive intervention. With a rainfall forecast providing a credible window for natural relief by 14–15 August 2026, and NREB maintaining hourly API surveillance, the state’s response demonstrates the institutional framework built to manage recurrent transboundary haze events.
The broader challenge of transboundary haze from West Kalimantan remains a regional concern requiring sustained diplomatic engagement and cross-border environmental governance — solutions that extend well beyond any single cloud seeding operation.
Members of the public seeking updates on API readings and air quality advisories in Sarawak may contact the Natural Resources and Environment Board (NREB) Sarawak directly:
For official air quality updates and enquiries:
- Website: www.nreb.sarawak.gov.my
- Address: Natural Resources and Environment Board Sarawak, Wisma Sumber Alam, Petra Jaya, 93592 Kuching, Sarawak, Malaysia
- Phone: +60 82-477 000
- Email: info@nreb.sarawak.gov.my
Readers are advised to check official NREB communications for the most current API readings and any changes to the cloud seeding assessment.