2006 Southeast Asian haze

The 2006 Southeast Asian haze event was caused by continued uncontrolled burning from "slash and burn" cultivation in Indonesia, and affected several countries in the Southeast Asian region and beyond, such as Malaysia, Singapore, southern Thailand, and as far as Saipan;[1] the effects of the Haze may have spread to South Korea.[2] Local sources of pollution partly contributed to the increased toxicity, particularly in high-pollution areas such as ports, oil refineries, and dense urban areas. In the highly urbanised and industrialised Klang Valley of Malaysia in particular, the surrounding terrain acted as a natural retainer of polluted air, aggravating the situation when the haze set in.

Satellite photograph of the haze above Borneo

There is also a link to El Niño.[3] The haze was made worse than during previous occurrences by the El Niño-Southern Oscillation which delayed the year's monsoon season. Fires in Kalimantan produce great amounts of smoke, burn a long time and are difficult to extinguish because they are on peatland, and once lit the fires can burn for months and release gases that produce sulphuric acid.[4]

Air quality across the region appeared to improve in late October as heavy rainfall doused fires in Indonesia.[5]

Countries affected


Brunei, an independent sultanate that is surrounded by East Malaysia's Sarawak state on Borneo, had been affected by the haze from Kalimantan. Rains brought some relief, and on 8 October, the Pollutant Standards Index had dropped to 46, which is within the "good" range.[6] There was a brief spell of clear skies during the first week of Hari Raya, following a spell of rainy weather. But the haze returned on 31 October,[7] with the Department of Environment, Parks and Recreation recording a PSI of 49.[8][9]


The fires originated mostly in Kalimantan, the Indonesian part of Borneo, and on Sumatra, where they are set by swidden agriculturists employed by agroforestry concerns to clear land to grow pulp woods or market crops ahead of the growing season. Satellite images taken over Borneo on 4 October showing 561 "hot spots" areas where fires had been set.

Officials in neighbouring countries accused Indonesian officials of doing nothing to stop the fires, though forestry ministry officials said they had firefighters working to douse the blazes on state-controlled land. However, they conceded, most of the fires were on private land.[10] Indonesia planned to deploy its military to aid fire fighting effort.[11] To recruit more people to man the fire line, the government offered two days off for civil servants who volunteered for fire duty.[12] But the country lacked equipment for fighting forest fires, having aeroplanes that were too small to carry enough water to douse the fires.[13] In a bid to obtain bigger aircraft, the government leased two Beriev Be-200 aircraft from Russia, which are capable of skimming over water and taking on loads for sustained firefighting efforts.[14] The planes, which were flown and maintained by Russian crew, began operations on 1 November.[15]

The fires forced schools to close, delayed and cancelled airline flights, disrupted shipping and forced Indonesians to don face masks. Cities affected include Pontianak, West Kalimantan, Palangkaraya, Central Kalimantan and Pekanbaru, Riau.[16][17] The haze was blamed for a Mandala Airlines flight from Balikpapan, the provincial capital of East Kalimantan, skidding off the runway upon landing at Tarakan on 3 October, when visibility was reported at around 400 metres.[18] It has caused breathing problems for people in Riau and in Jambi Province.[19] On 21 October 12 airlines cancelled domestic flights from Soekarno-Hatta International Airport due to smog at many destinations, including Jambi, Banjarmasin, Jayapura, Semarang, Surabaya, Bengkulu, Denpasar, Makassar, Pekanbaru and Padang.[20]

A 20 October report by Malaysian government news agency BERNAMA offered a first-hand account of the scene in Kalimantan: "The suffocating smell of smoke, sore throat and eyes got worse when this reporter and a photographer stepped foot in central Kalimantan, forcing them to put on face masks. Throughout the 200-kilometre journey from Banjarmasin to Palangkaraya, what could be seen of the forests on both sides of the road was a landscape of blackish soil with smoke still billowing from the ground in some areas and of withering trees and plants. The area was foggy and dusty as the air was filled with flying ashes and other particles."

Local villagers, the report said, appeared to be unconcerned with the smog, saying it was "normal". "If we do not burn the forest, where are we going to get our food from?" a villager said.[21]

On the environmental front, fires destroyed 1 km2 of the Tesso Nilo National Park in Riau Province.[22] At the Tanjung Puting National Park in Central Kalimantan, the haze adversely affected the orangutans.[22]


The effects of the haze started in early July and affected the northern Malaysian states severely.[23] However, the haze had cleared substantially throughout Peninsular Malaysia from 29 August 2006 due to the arrival of the rainy season. The rain reduced the number of hotspots throughout Sumatra and the Malay Peninsula. On 30 August 2006, The Star reported that Kuala Lumpur would be free of haze during the Independence Day. In the late evening just before midnight on 31 August 2006, the visibility in the Klang Valley was recorded to be very good.

Unfortunately, the haze returned again in late September when Muslim Malaysians were experiencing Ramadan. This was partly due to a change of wind direction towards the southwest, partially caused by Typhoon Xangsane.[24] The worst hit place was Kuching. The Sarawak state government had declared that schools would close if the API breaches the 300 mark.[25] The worst affected area in Peninsular Malaysia is Johor Bahru which recorded an API of 150 on 7 and 8 October. For now, many people are wearing masks to prevent themselves from inhaling excessive amounts of haze. On 7 October, visibility in parts of East Malaysia fell to 300 metres. On or about 9 October, the worst of the haze in Peninsular seemed to be in the state of Negeri Sembilan, where visibility in Sepang fell briefly to 500 metres and the API in Nilai reached 198, before the rain relieved the haze partially. Shortly thereafter changing winds caused conditions to improve rapidly. Sarawak has started cloud seeding attempts to try to encourage rainfall that will help relieve the haze.[26] Each cloud seeding session costs at least RM50,000 (roughly US$14,000).[27] On 21 October, the winds has changed direction and started to blow the hazes away from Malaysia, and the following day, heavy rain has cleared the haze. Later on 26 October, the heavy rain returned again, and there were isolated showers in Klang Valley. The Star reported that the hazy days are soon coming to an end as the monsoon season is approaching.

Air pollution index

The business district of Kuala Lumpur in the evening of 29 September 2006. Menara Kuala Lumpur was barely visible. The average API for that day was in between 70 and 80.
Overlooking the Perdana Lake Gardens in Kuala Lumpur at noon of 16 October 2006. The API read 76 at 11 AM. On a clear day, the Parliament and the National Monument would be visible on the horizon.
Similar shot on the morning of 2 November 2006. Notice the Parliament, the Tugu Negara and the mountains.
Daily average API readings in October 2006[28]
DateGeorge TownKuala LumpurMalacca TownJohor BahruKuantanKuching
Daily average API readings in November 2006[28]
DateGeorge TownKuala LumpurMalacca TownJohor BahruKuantanKuching

  0–50  Good  51–100 Moderate 101–200 Unhealthy 201–300 Very unhealthy 301- Hazardous


While the haze largely spared Singapore with 24-hour Pollutant Standards Index readings within the "Good" range for 15 days in September and the rest in the "Moderate" range and no higher than a reading of 66,[29] its harmful effects became more prevalent in October.

On 7 October 2006, the 3-hour PSI reading breached the 100 mark at 8 a.m. and entered unhealthy levels for the first time in the year, as winds from neighbouring Sumatra blew the haze to Singapore.[30] At 10 a.m., it hit 130, the highest in three years, before subsiding to 80 at 4 p.m. and climbing rapidly to 150 at 9 p.m.,[31] the worst since 1997, before ending the day at 136, still in the unhealthy range.[32]

Although the air quality was set to improve with the arrival of the Northeast monsoon rains in mid-October, southeasterly winds extended the hazy season.[33] A mild El Niño effect delayed the starting of the showers to late October or early November,[22] or even until the end of November. The prolonged haze could be attributed to the extended dry season, which put the rains on hold and affected wind patterns which brought the haze to Singapore. Intermittent showers could occur in the pre-monsoon period, but these would do little in increasing air quality. The unpredictable winds in the pre-monsoon period could bring haze from either Sumatra or Kalimantan.[34]

Air quality remained in the moderate range for the next week[29] until 14 October, when the 3-hour PSI readings gradually increased from 53 at 6 a.m. to peak at an unhealthy 116 at 10 p.m.[35] This time, majority of the haze came from Kalimantan.[36]

Similarly, on 15 October, the PSI readings increased from 69 at 6 a.m. to 98 at 3 p.m. and 4 p.m.,[37] 3 points short of reaching the unhealthy range. This eased to 82 by midnight.[38] As winds remained southeasterly, haze from Kalimantan blew across the South China Sea to Singapore.[39]

The next day, on 16 October, the PSI stayed in the 80s in the morning, before shooting up once again into the unhealthy range, hitting a high of 130 at 4 p.m. and 5 p.m. The 3-hour PSI remained in unhealthy levels for 8 consecutive hours, between 2 p.m. and 9 p.m.[40] The haze obscured the sun, and symptoms of exposure to haze resurfaced in the general population.[41] The 24-hour PSI for 16 October reached 98,[29] just 3 points short of unhealthy. Visibility dropped to as low as 1 km in some areas, compared to the usual 20 km.[40]

The PSI on 17 October gradually increased from the moderate range in the morning to slip into the unhealthy range at 4 p.m., reaching 106,[42] before declining back to 100 in the moderate range at 10 p.m.[43] The hazy conditions were expected to persist.[42]

On 19 October, the PSI crept into the unhealthy range at 106 at 2 p.m.,[44] peaking at 113 at 4 p.m. The National Environment Agency reported that the situation would not improve the next day.[45]

Throughout the early morning on 20 October, the PSI kept in the 90s, before reaching a high of 103 at 8 a.m.[34] This dropped to 74 by 7 p.m., although the PSI remained in the 90s in the afternoon.[46] Even though rain fell in some areas, this was not enough to "alleviate the haze situation". The NEA forecast thunderstorms over the weekend, but the southeasterly winds would continue to prevail.[47] The 24-hour PSI on 20 October also reached the unhealthy range at 102.[29]

Later in October, though, the situation began to improve, with the PSI hitting a low of 11 at 2 p.m. on 26 October.

However, in early November, intermonsoonal winds brought slight haze back to Singapore, with the 3-hour PSI in the moderate range most of the time.

The highest 3-hour average PSI recorded prior to that point 226 in September 1997.[48]


While some Singaporeans began donning face masks, others frequented shopping malls and public places like VivoCity, with many shopping before Deepavali at Little India,[49] and going to Geylang Serai's annual Hari Raya bazaar. Stallholders said that the haze had not affected their business.[50] However, Singaporeans generally kept indoors,[38] with some staying away from East Coast Park.[49]

The government announced plans for a haze action plan if the situation became "extremely dangerous", which included priority treatment for haze-related illnesses.[51] Health Minister Khaw Boon Wan said that there was "very little that (could) be done to stop the haze", and advised people to remain indoors, especially those with prior respiratory conditions.[52]

Some minor haze-related illness began to surface, but free clinics across the island did not report any increase in patients with this symptoms.[35] However, attendance figures at polyclinics islandwide increased by 600 cases to about 15,000 cases of haze-related conditions in the first week of October as compared to the same period last month.[51] This is despite the National Healthcare Group reporting that the number of people "complaining of the same ailments" has decreased from the same period last year.[53]

Air purifier sales shot up during the hazy period. Best Denki, an electronic store, sold S$350,000 worth of air purifiers and related items in 4 days, a 300 percent increase. However, experts from the Institute of Environmental Science & Engineering at the Nanyang Technological University said that only some of these products, like High Efficiency Particulate air filters, would effectively remove small particles from air. Other kinds of air purifiers like ionizing purifiers gave off ozone which could cause symptoms similar to those caused by the haze. The experts recommended regularly cleaning the filter media and opening windows to get some fresh air at night.[54]

The western region, which includes Boon Lay, Choa Chu Kang and Jurong, seemed to be the "epicentre" of the haze. Residents there complained of the worse conditions in their area, saying that it felt "hotter than usual", and health problems were more widespread. The air quality levels in the west may have consistently been the worst, but only by several points. Some speculated that the more polluted air was caused by the many construction sites and industrial parks in Jurong, but NEA refuted this, claiming that they did not contribute to the haze. Polyclinics in Jurong and Bukit Batok had an increase of 20 percent admission for patients with respiratory problems and asthma.[53]

Schools islandwide restricted outdoor activities and had to rethink post-examination activities and training or revert to wet-weather programmes. The Singapore Sports School's swim team had to cut back on training when the haze reached unhealthy levels even though they were in the midst of various international competitions.[55] The Ministry of Education recommended that schools suspend all outdoor activities when the PSI reading passes 100, but some schools chose to move indoors regardless of the PSI.[56]

Many Singaporean "fitness buffs" also made the move indoors. Fitness clubs reported increases in turn-outs and check-ins, utilising gym facilities rather than outdoor activities. Rock climbers were also affected, and began to move activities indoors instead.[57]

The haze also caused increased sales and rental of entertainment VCD and DVD titles, but cinema attendance was unchanged.[58]

The National Environment Agency website received about 170,000 hits on 14 October, as compared to the usual 60,000, and caused the server to temporarily go down due to the sheer volume of traffic.[22]

According to economists, Singapore suffered a US$50 million economic loss due to the onset of the haze in 2006.[59]

PSI readings

Singapore's Jurong East neighbourhood being blanketed by the haze.
Merlion Park at the mouth of the Singapore River as seen from the Esplanade in unhealthy PSI levels.
24-hour PSI readings in October 2006[60]

  0–50  Good  51–100 Moderate 101–200 Unhealthy 201–300 Very unhealthy 301- Hazardous


In July, the southern Thai provinces of Pattani and Satun suffered an on-and-off bout of smog, with the levels of pollutants in Satun being high enough to constitute a health hazard.[61] In all, seven provinces were affected by the haze in July and August.

Haze was again reported on 6 October, with respiratory illnesses and eye irritation reported in Narathiwat.[62] Visibility and air quality were also affected in Songkhla, Satun and Yala. Health warnings were issued and surgical masks were issued to residents. Three days later, meteorological officials reported that the haze had thinned to almost normal visibility.[63]

Strong winds in the region brought haze from Indonesia back into Songkhla, Satun, Pattani, Yala and Narathiwat provinces on 17 October. Visibility in Yala and Songkhla was reduced to less than a kilometre, and officials warned fishermen going out to the Andaman Sea and Gulf of Thailand to "stay vigilant". Drivers were also asked to turn on their headlights.[64]

ASEAN Ministerial Meeting on Transboundary Haze Pollution

Malaysia and Singapore criticised the way Indonesia handled the issue. Both urged the latter to ratify the ASEAN Agreement on Transboundary Haze Pollution. The Malaysian Environment Minister Azmi Khalid said "Frustration is an understatement", directed toward Indonesia.[65] There was also a protest in front of the Indonesia embassy in Kuala Lumpur, organised by local political parties.[66] Singaporean Prime Minister Lee Hsien Loong expressed disappointment toward Indonesia soon after Azmi Khalid made his view public.[67] In response to the letter, Indonesian President apologised for the regional haze.[68] Indonesia has earlier stated that it lacked the resources to combat the burning effectively.[69]

Singapore proposed regional talks on the haze, to be held in Singapore. Indonesia, however, requested such talks to be held in Pekan Baru, Kalimantan instead.[70] The request was agreed to and talks were held on 13 October 2006. At the meeting, Malaysia proposed the setting up of a regional fund to help combat the environmental disaster.[71]

With the arrival of the northeastern winter monsoons in December, the haze problem was effectively ended for 2006.

See also



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