The hazy condition persists in Singapore with the air quality continues to remain at hazardous level.

Today, all primary and secondary schools in Singapore are closed.

As at 10am, the 24-hour Pollutant Standard Index (PSI) ranged from 264 to 321 in hazardous range and the three-hour PSI was 256, according to the National Environment Agency.

A 24-hour PSI reading of above 100 indicates the air quality is unhealthy, PSI of between 201 and 300, very unhealthy, while PSI above 300 is hazardous.