Is Bali's Air Bad? Trash, Crop and Landfill Burning, and Where It Is Cleaner

Does Bali have a burning season?

Not one island-wide season like Chiang Mai's, but it does have burning: trash all year, rice fields after harvests near the fields, and occasional landfill fires in the dry season. Chiang Mai's smoke follows the calendar: farmers and forest fires turn February to April into a predictable haze. Bali has no such schedule. What nomads smell and see on the island is mostly open trash burning, which can happen in any month, with rice-field and landfill burning on top in some places and years.

The trigger is recent. On 1 April 2026 the Suwung landfill in Denpasar, Bali's largest, stopped accepting organic waste, with full closure set for 1 August. The Jakarta Post reported that residents of Denpasar were burning rubbish at home or on empty plots, with uncollected piles building up by roadsides and in rivers, and a strong smell of burning plastic. The Bali Sun reported trash fires visible across central south Bali. Neither article gave measured air readings. We could find no reporting that confirms what happened after the 1 August date, so we do not say whether the landfill is closed today.

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What are the causes of smoke in Bali?

There are five, and they behave differently. Separating them is the useful part.

1. Local trash burning: any month, worst where people are dense. This is the cause nomads actually notice, and it is hyperlocal. A pile on the next plot can ruin one street while the next village is fine. Reports point to the densely built south: Denpasar, Kuta, Seminyak, Canggu. Because it depends on the neighbourhood and not the month, a month-by-month ranking cannot tell you much about it.

2. Rice-field burning: near the fields, after harvests. Residents report smoke from farmers burning stubble around Canggu, Pererenan and Seseh, and in the Ubud area, at several points in the year. We found no public source with dates or measurements, so we do not give a calendar: the timing differs by area and year, and how much you get depends on how close you are to the fields, not on the village name. Our practical rule: if there are rice fields next to the place, ask.

3. Landfill fires: occasional, dry season. Landfills smoulder when methane builds under the waste. The Suwung landfill in Denpasar caught fire in 2018 and again in October 2023, when Bali.live reported smoke reaching Sanur, Denpasar, Kuta and, according to some reports, Canggu. The Mandung landfill in Tabanan burned on 14 October 2023. These are rare events but they do land in the dry months.

4. Traffic and power: all year, in tourist zones. Bali has about five and a half million registered vehicles and the number grows every year. The island has chosen six areas, among them Ubud, Kuta, Sanur and Nusa Dua, for an exhaust-reduction programme running to 2030, according to Bali.live. The governor's claim that traffic and power plants cause most of the island's air pollution is a government statement, not an independent measurement. Treat it as a reason traffic matters, not as a number.

5. Haze from fires in Sumatra and Kalimantan: dry-season years, and in the reports we found, not Bali. These fires blanket parts of Sumatra, Kalimantan, Malaysia and Singapore, worst around August to October and longer in El Niño years. A Bali.live report quotes the weather agency BMKG and Bali's disaster agency saying satellite images showed the smoke had not reached Bali, because dry-season easterly winds carry it west and north-west, away from the island. The page is undated, so read it as one episode, not a guarantee. If you see a hazy, orange sky in September or October, a wildfire is a less likely explanation than local burning.

Which months are worse in Bali?

We cannot honestly name a bad month, and that is itself the finding. The only long record we found, from a community sensor in Kerobokan near Canggu, read higher from February to October and lower from November to March, but its own compilers say that cannot be confirmed as a seasonal pattern with so little data. Across its 469 recorded days, a typical day read about 22 micrograms per cubic metre. That was above the WHO 24-hour guideline of 15 µg/m³ on about 68 percent of days, and above 25, the older guideline the sensor's own site still uses, on about 44 percent. It is one sensor, run by residents campaigning for more monitoring, and it is now offline.

Our own data is a model, not a sensor. It comes from the CAMS global air-quality model through Open-Meteo, on a grid of roughly 45 km. It cannot see a single burning pile, and on bad days it reads well below real stations (see how we handle this on the Chiang Mai page). What it can show is the background level by month, for the average of 2023, 2024 and 2025:

Read it for the shape, not the level. At the coast the model is flat through the year at around 8 to 13 µg/m³, with no dry-season spike like the one it shows for Chiang Mai. Ubud reads higher and rises toward the end of the year; that could be the valley holding air, a different model cell, or a model change, and we cannot tell which. The point that matters: the model suggests Bali has no regional smoke season. It says nothing about the street you will live on.

The dry months do matter in one way: rain washes smoke out of the air, and there is less of it in the dry season. Here is what Canggu, Ubud and Uluwatu get in August and September:

For how the seasons split on rain, see our Bali rainy season guide.

How few sensors does Bali have?

Very few, and that limits every claim on this page. When a resident-run data brief counted in April 2026, it found:

• one government station listed as active, at Sempidi in Badung, with unclear PM2.5 coverage;
• the Denpasar government station offline since August 2025;
• about four private Nafas sensors (Ubud, Denpasar, Sanur, Pemogan), about ten contributors on IQAir, and two PurpleAir units, at Jimbaran and Klungkung;
• no government sensor in Ubud, Canggu or Kerobokan.

That is a handful of points for an island of more than four million people. A "Bali air quality" number on a website is usually one of these, often in Denpasar, and Denpasar is not Canggu. Whenever someone quotes you a figure for a Bali area, ask which sensor, and on what date.

Which areas of Bali tend to be cleaner?

Honestly: nobody can rank them with data yet. What can be said, with labels, is in the three cards below.

For how the three compare on weather, see Canggu vs Uluwatu vs Ubud and the best time to visit Bali by area.

Where to go instead: three areas to check first

• Dense south: Kuta, Seminyak, Canggu

  Where the reports of trash fires and the highest sensor readings are. Traffic adds to it.

  Suits: people who will check live readings for their street before booking

• Uluwatu and the Bukit

  More open, coastal and breezy, with fewer homes per hectare and no rice fields, which is why residents use it to escape smoke. The one coastal sensor we know, at Jimbaran next door, read clean in April 2026. That is one reading. Our model reads the same as Canggu here, so it adds nothing.

  Suits: anyone choosing by air first: the best bet we can name

• Ubud

  A valley town, not on the coast. It is in the exhaust-reduction zones, and our model reads higher there than on the coast.

  Suits: people who want the valley and will check live readings first

What to check before you book

1. Look at live readings for your area, on IQAir and AQICN. Search Denpasar and Badung, then check whether the nearest sensor is actually near where you will live, and when it last reported.
2. Ask the host about burning. On a viewing, ask whether neighbours burn rubbish and how the property handles its own. This is a question about the street, not the month.
3. Look at the satellite view. Are there rice fields next to the villa? Distance from the fields matters more than the village name.
4. Visit at the time of day you will work. Burning is often in the evening and early morning.
5. Look at the sky and smell the air. A sensor can be offline; your nose is not.
6. If you are sensitive to smoke, keep a month of slack in your plans and check live readings. Beyond that we give no health advice.

Bali or Chiang Mai for air?

Pick by the month. From about February to April Chiang Mai is the worse bet, with a predictable and often severe smoke season. For the rest of the year it is usually much better. Bali has no equivalent block of bad months, but it has an unpredictable risk of local trash smoke every month, and Bali's sensor coverage is far thinner, so we know less. If you need certainty about air in a given month, Chiang Mai's pattern is easier to plan around; if you can pick your street and check it, Bali's can be managed.