Thick haze from land-clearance fires in Indonesia has continued to shroud parts of Malaysia.
Visibility in the capital, Kuala Lumpur, remains poor
Visibility in the capital, Kuala Lumpur, remained poor on Monday as officials ordered schools closed in Kuala Lumpur and Selangor state.
In Singapore air quality continued to improve after last week's record haze, as wind conditions changed.
Indonesia is working to control the blazes but so far cloud-seeding has not produced enough rain, an official says.
Sutopo Purwo Nugroho, a spokesman for Indonesia's national disaster agency, said they had "carried out 14 water-bombings, dropping a total of 7,000 litres (1,820 gallons) of water onto the fires".
He added that altogether, four helicopters had been deployed for water-bombing operations while two planes were conducting cloud-seeding, AFP news agency reported.
However, Indonesian disaster agency official Agus Wibowo told AFP that two cloud-seeding attempts tried in Riau province over the weekend were not successful.
"The cloud-seeding technology is meant to speed up rainfall, but with few clouds, there's little we can do. The rain was more like a drizzle."