2013 Southeast Asian haze

The 2013 Southeast Asian haze was a haze crisis that affected several countries in Southeast Asia, including Brunei, Indonesia, Malaysia, Singapore and Southern Thailand, mainly during June and July 2013. The haze period was caused by large-scale burning in many parts of Sumatra and Borneo. Satellite imagery from NASA's Terra and Aqua satellites showed that the haze was mainly due to smoke from fires burning in Riau province, Indonesia.

The 2013 Southeast Asian haze was notable for causing record high levels of pollution in Singapore and several parts of Malaysia. The 3-hour Pollution Standards Index in Singapore reached a record high of 401 on 21 June 2013, surpassing the previous record of 226 set during the 1997 South East Asian Haze. On 23 June, the Air Pollution Index (API) in Muar, Johor spiked to 746 at 7 a.m. which was almost 2.5 times above the minimum range of the Hazardous level thus resulting in the declaration of emergency in Muar and Ledang (which was afterwards lifted on 25 June in the morning), leaving the towns in virtual shutdown.

On 19 June 2013, NASA's Terra and Aqua satellites captured images of smoke from illegal wildfires on the Indonesian island of Sumatra blowing east toward southern Malaysia and Singapore, causing thick clouds of haze in the region. As stated by a local Indonesian official, the source of the haze might be a 3,000 hectare peatland in Bengkalis Regency, Riau Province, which was set ablaze by an unknown party on 9 June. As many as 187 hotspots were picked up by satellites on 18 June, down to 85 on 20 June.

On 21 June 2013, a total of 437 hotspots were detected in Sumatra. Two days later, the number was down to 119. On 24 June 159 hotspots were detected in Riau, out of a total of 227 detected in Sumatra. An air force officer explained that the low number of hotspots detected on some days was due to heavy cloud cover, which prevented the satellite from detecting some of the hotspots. The Malaysia Department of Environment said that 173 hotspots were detected in Malaysia on 24 June, with 1 in Negeri Sembilan, 1 in Terengganu, 3 in Sabah, and 168 in Sarawak. Many of the hotspots were owned by palm oil companies or smallholder farmers who supply palm oil to these companies and use traditional slash-and-burn methods to clear their land for the next planting season. However, Singapore's Prime Minister, Lee Hsien Loong, said that the fires were most likely started by errant companies, instead of slash-and-burn by smallholders. On 25 June, Indonesia's president Susilo Bambang Yudhoyono issued a formal apology to Malaysia and Singapore for the hazardous smog.

...
Wikipedia