The Pollutant Standards Index (PSI) has surged to a new high of 400 at 11 am on Friday.
The reading surpassed the 371 recorded at 1 pm on Thursday.
From Friday, the National Environment Agency will issue a rolling 24-hour PSI reading every hour on its website, in addition to the three-hourly updates, to give a better sense of the likely impact on people's health.
The Government will also hold daily briefings to keep the public up to date.
Prime Minister Lee Hsien Loong has asked Defence Minister Ng Eng Hen to head a Haze Inter-ministerial Committee. Mr Lee, at a press conference on Thursday, also pledged to focus on protecting vulnerable Singaporeans, working with the Indonesians to stem the problem and keeping the country going.