Bali Air Dispatch

§ IThis is a sequencing problem, not a tech gap.

The honest framing of Bali's April–May 2026 burning pattern is that the technology to fix the underlying waste flow already exists, and a meaningful portion of it has been deployed somewhere on the island already. Each extension of the Suwung landfill's organics-closure timeline, reported in the local press through the first half of the year, has named the same constraint: Bali's processing alternatives are not yet sized to absorb the more than one thousand tonnes a day the province generates, and households have resorted to open burning in the gap.

The point matters because it changes what "doing something on the ground" should look like. It is not a question of inventing a new method. It is a question of sequencing, financing, and building in the right order. The rest of this dispatch is organised around that point — the technologies that work, listed in roughly the order of how much of the burn problem each would actually absorb, then a four-step sequence drawn from local experience.

§ II · The big leverOrganic processing first.

Roughly two-thirds of Bali's household waste is organic. Denpasar's own figures put food scraps and garden debris at about 68 per cent of the city's stream. If that fraction is diverted from the household pile, the volume left for the burn-it-yourself default shrinks dramatically. Three proven technologies operate on Bali at small or pilot scale right now:

• Black Soldier Fly bioconversion BSF larvae eat food waste fast in a tropical climate, yielding animal feed and an organic soil amendment. Bali's provincial environmental agency has explicitly named BSF technology in its solution set.
• Anaerobic biogas digesters Capture the methane from organic decomposition and produce a clean cooking fuel as output. Suitable at household, banjar, or facility scale.
• Decentralised composting The lowest-tech of the three, the most labour-intensive, and the easiest to set up at banjar-level scale with limited capital. The output goes back into Bali's gardens and rice paddies.

§ III · The backboneNeighbourhood-scale infrastructure.

The layered model already on Bali's planning paper distinguishes TPS3R — small recycling and recovery centres at the neighbourhood level — from TPST, larger integrated facilities that handle sorting and consolidation at urban scale. The two are designed to work together: TPS3R captures and pre-sorts at source, TPST consolidates the streams. This is the backbone of a functioning municipal waste system. It works when built ahead of any disposal ban, not after one.

The Indonesian Institute for Essential Services Reform has placed all three of the organic technologies — BSF, biogas, decentralised composting — within the recognised provincial planning framework, alongside TPS3R/TPST. None of this is speculative. The plan exists. The question is sequencing.

§ IV · Recovering the restMaterial recovery, formalised.

For the inorganic fraction — plastic, glass, metal, paper — material-recovery facilities paired with buy-back schemes can turn refuse into a small but reliable income stream. The opportunity here is to formalise the substantial work already done by informal waste pickers, who, by hand, recover an enormous share of Indonesia's recyclables. A buy-back scheme gives that workforce a price floor and an accountable counterparty. Sungai Watch's separate three-tonnes-a-day plastic-processing operation at its Bali headquarters demonstrates that the throughput can scale.

§ V · With a caveatWaste-to-energy.

The Suwung PSEL waste-to-energy facility is expected to begin operating in 2028. As a politically attractive, big-ticket option, it has obvious appeal. The cautionary footnote — common to incineration projects globally — is that a PSEL plant needs a steady stream of waste to remain financially viable, and that need can quietly discourage the upstream reduction, composting, and recycling that actually pull the problem down.

Used for true residuals — the small fraction that none of the earlier steps can handle — incineration has a defensible role. Used as the first move, it tends to ossify the very volumes it was meant to retire. Sequencing, again, is the operative word.

§ VI · To see what you are fixingLow-cost sensors.

None of the above can be measured against a baseline without a record. Cheap laser-scatter sensors at around US$200–300 per unit, deployed by community organisations and reporting to a public dashboard, would let Bali map burn hotspots in real time, target collection routes and enforcement at the streets where it would actually matter, and give residents and visitors an honest health figure during the smoke-heavy hours of the day.

These sensors are not reference-grade — Dispatch I covered their limits in detail — but their density and openness more than compensate for the slack. They can be deployed in weeks. The model is the PurpleAir-style network already in use across the United States and parts of Europe, in which thousands of $200 instruments, taken together, produce a public-health-grade picture of urban air better than the small number of regulatory monitors ever did alone.

§ VII · The sequenceA four-step order of operations.

Drawing the steps together — and drawing on the local expertise quoted in The Diplomat, Asia News Network, and the published submissions of researchers at IESR and CCAC — the practical order of operations looks like this. None of it requires inventing a new technology. All of it requires choosing what to build in what order.

1. Stop the bleeding. Restore reliable collection first. The burning is, in significant part, a direct response to trucks that have stopped showing up since 1 April. Re-establish a temporary or alternative collection arrangement — even an interim one — before anything else. People burn when there is nowhere else for the rubbish to go.
2. Flood the zone with BSF and composters at banjar scale. Bali has an asset other Indonesian provinces do not — the desa adat customary village system. Empowering desa adat is a unique lever for both implementation and enforcement. Door-to-door collection plus on-site composting and BSF processing is already running in parts of Gianyar at scale.
3. Copy Gianyar's sequence, not Suwung's. The single most important lesson is timing. In Gianyar, the new waste infrastructure was built and proven before the corresponding ban took effect. That order — infrastructure first, then enforcement — is the difference between the working model and the present crisis. It is also imitable, and the model already exists on the same island.
4. Fund it and enforce it. One local expert quoted in Asia News Network framed it bluntly: this is solvable, provided policy is matched with funding and enforcement. A small tourism levy, in an economy whose primary export is the climate itself, would underwrite the capital cost without distorting visitor flows. Bali's economic dependence on tourism is also its strongest argument for action — the smoke is also a tourism risk.

§ VIII · A funding proposalA foreign-visitor levy that would settle the bill in a year.

The province already operates a tourism levy of IDR 150,000 per foreign arrival, introduced in February 2024 — a useful precedent, but a rate small enough that collection lapses have been forgiven on both sides. Raising the levy to IDR 1,000,000 per foreign arrival — and collecting it consistently at the airport, port, and immigration counter — would generate revenue more than sufficient to finance the entire waste-and-air transition within a single year.

The math is not large in tourism terms. IDR 1 million is roughly USD $60 — about three per cent of what a typical visitor already spends across a one-week trip to Bali. The province received approximately 6.3 million foreign arrivals in 2024, per BPS Bali; at one million rupiah a head, that is on the order of IDR 6.3 trillion (~USD $380 million) a year. By comparison, a neighbourhood TPS3R facility costs around IDR 1–3 billion to build, and an island-wide low-cost sensor network well under IDR 1 billion. Banjar-scale BSF deployment, decentralised composting, and a buy-back recycling programme together would still leave most of the levy untouched.

The argument is straightforward. Visitors come to Bali for an environment that the present waste flow is visibly degrading. Asking them to contribute a small share of their trip's cost to preserve what they came for is not punitive — it is the cleanest way to align the people who benefit from the climate with the people who pay to keep it functioning. Those who would rather not pay have an alternative: they need not come. The tourism economy can absorb the choice in either direction. The waste-and-air transition cannot wait either way.