Mild haze was detected in Singapore on Monday 30th Dec.
However, the PSI did not exceed 50, which means air quality remains in the 'Good' range (0-50).
According to the National Environment Agency (NEA), air quality has deteriorated since Sunday.
The NEA said northeasterly winds were blowing dust particles from the northern ASEAN region, where 110 hotspots were detected on Sunday.
Minister for the Environment and Water Resources Vivian Balakrishnan said on his Facebook page that it is a reminder we can never take the environment for granted.
NEA assured the air quality should improve the next few days as rain is forecasted.