Singapore is shrouded in a smoky-smelling haze as pollution from forest fires in Indonesia's Sumatra island spreads to neighbouring countries.
The Pollutant Standards Index reading at noon on Monday stood at 80, in the higher range of the "moderate" band, according to the National Environment Agency (NEA) website. Any reading above 100 is considered unhealthy.
The haze was visible at street level in Singapore's central business district but has so far not affected business or air transport. Singapore schools are on holiday.
People with heart and lung disease, those over 65 and children are advised to "reduce prolonged or heavy outdoor exertion" even in moderate conditions.
"The hazy conditions are expected to persist for the next few days," the NEA said.