NEA: Expect hazy conditions today
HAZY conditions are expected today, said the National Environment Agency (NEA) yesterday.
The 24-hour Pollutant Standards Index (PSI) - a measure of air quality - for the next 24 hours is expected to be in the low to middle section of the unhealthy range and may further deteriorate if the winds are unfavourable, NEA said in an 8pm statement.
Prevailing winds are also forecast to blow from the south or south-west today.
Yesterday, air quality crept into the unhealthy range from as early as 3am yesterday morning, with the 24-hour PSI registering readings of between 92 and 100 across Singapore.
NEA said the occasionally hazy conditions were due to haze being blown in from Sumatra by prevailing winds.
At 9pm, the 24-hour PSI readings across Singapore ranged from 93 to 106, in the high end of the moderate range and low end of the unhealthy range.
The 24-hour PSI remained close to this range throughout most of yesterday.
When 24-hour PSI readings are below 100, normal activities can be carried out. But when they start to inch above 100, the authorities advise healthy people to reduce prolonged or strenuous outdoor activities. The elderly, pregnant women and children should do as little of such activities as possible, while those suffering from chronic lung or heart disease should not engage in these activities.
NEA said in a haze situation update on Saturday that haze experienced in Singapore was due to "the spread of haze from Sumatra and the surrounding region under light wind conditions".
Widespread smoke haze was also observed in central and southern Sumatra, the agency said.