Firefighters are continuing to tackle forest fires in Indonesia that have led to a thick haze in some cities as well as Singapore and parts of Malaysia.
Hospitals in Dumai and Bengkalis in Indonesia's Riau province have recorded increases in cases of asthma, lung, eye and skin problems, health official Arifin Zainal told Reuters.
Free face masks are being distributed and authorities have advised residents to stay indoors with their windows shut.
Air pollution levels in Singapore have soared to a 16-year record high for a third consecutive day, as a smoky haze from forest fires in Indonesia shrouds the city state.
Its main air pollution index hit a measurement of 401 at midday, which is classified as "hazardous" and can aggravate respiratory ailments, the Associated Press reports.
Indonesia's Environment Minister met with Singapore's Environment and Water Resources Minister today to discuss solutions and efforts to mitigate the impact of the fires.
The haze is a recurring problem as a result of forest fires in the dry season, some of which are deliberately started to clear land for cultivation.
A haze is blanketing Singapore after fires in Indonesia, which could persist for weeks or even longer, according to the Prime Minister.
Lee Hsien Loong warned of consequences if Singapore-linked companies were found responsible for the burning.
The illegal burning of forests and other land on Indonesia's Sumatra island, to the west of Singapore, to clear space for palm oil plantations is a chronic problem, particularly during the June to September dry season.
At 1 pm local time yesterday, Singapore's pollution standards index (PSI) soared to a new high of 371, indicating air quality was "hazardous".