[UPDATED 19 June, 9:00PM: 3-hour PSI reading hit a new record high of 290 at 9pm on Wednesday, higher than the previous peak of 226 in 1997 and well into the "very unhealthy" range.]
The Pollutant Standards Index (PSI) hit a new high of 290 at 9pm on Wednesday, well into the "very unhealthy" range of 201-300, according to data from the National Environment Agency (NEA).
On Tuesday at 12pm it reached 115 which is still within the "unhealthy" range.
On Monday at 10pm, the reading hit 155, the highest Singapore has seen in 16 years. The PSI has been climbing steadily since Monday from 55 at 9am to 80 at 12pm and crossed into the "unhealthy" range of 105 at 3pm, according to the National Environment Agency (NEA).
Any reading between 101 and 200 is considered “unhealthy”.
Over the weekend, the haze situation also hit “unhealthy” levels in neighbouring Malaysia. The Malaysian pollutant index showed readings of 102 and 121 in parts of Pahang, Terengganu and Malacca on Monday.
Singapore experiences hazy weather conditions on a yearly basis when winds from Indonesian forest fires blows over the region during periods of persistent dry weather conditions.