An aerial view of Palembang city covered by smoke from the forest fire in South Sumatra province, Indonesia on Monday. Reuters
Indonesia warned its citizens of more choking smoke from forest fires on Tuesday as several provinces closed schools due to worsening air quality.
An El Nino weather pattern this year has intensified annual dry-season fires, often caused by slash-and-burn clearing of forests and bush for farming, including plantations.
The number of hot spots in parts of Sumatra and Borneo islands has been on the rise over the past week despite some rain, Indonesia's weather agency said in a statement, warning that residents should be on alert for smog.
A total of 1,547 hot spots, which indicate fires or heightened risk of fire, were detected in six provinces, the agency said, adding that smoke from the blazes may affect more provinces depending on the wind direction.
The statement made no mention of potential cross-boundary smoke. Thick haze from fires had drifted to neighbouring countries at the height of the dry season last month, triggering a diplomatic dispute between Indonesia and Malaysia.
Some schools which had reopened after air quality improved, shut again this week.
Authorities in Palembang, the provincial capital of South Sumatra, closed schools for three days from Monday with an extension if conditions did not improve, state news agency Antara reported.
Residents were advised to wear masks when going out.
An aerial photograph taken on Monday showing Palembang engulfed in thick, yellow haze featured on the front page of the Jakarta Post newspaper on Tuesday.
Jambi, another city in Sumatra, has closed kindergartens for three days, Antara reported, citing a city government official.
"As a protective measure against smog, all students, teachers, and administrative employees are urged to wear face masks while they are in schools and on the way to and from schools," Jambi government spokesman Abu Bakar, was quoted as saying.
For months, Indonesia has deployed thousands of personnel to fight the fires, utilising dozens of aircraft to conduct water bombing and cloud-seeding efforts to trigger rain.
Indonesia's disaster agency last month said it expected the arrival of the rainy season - due at this time - to end the fires, which have affected more than 320,000 hectares of forests.
Toxic haze from Indonesian forest fires closed thousands of schools across the country and in neighbouring Malaysia on Wednesday, while air quality worsened in Singapore just days before the city’s Formula One motor race.
Forest fires are an annual occurrence in Indonesia. Forest fires in 2015 spread haze across a swathe of Southeast Asia, and according to a study by Harvard and Columbia universities, hastened 100,000 deaths.
Indonesia’s economy expanded more slowly than expected in the first quarter of this year, as investment dropped ahead of elections and campaign spending failed to sustain growth momentum. Southeast Asia’s largest economy grew 5.07 per cent in January-March from a year earlier,
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