Singapore's Pollutant Standards Index (PSI) is creeping back up after a slight reprieve from Wednesday night's peak of 321, the worst reading in the country's history.
An 11am update on Thursday saw the PSI rising to 198 from 152 just an hour earlier and 131 at 9am.
Air becomes "hazardous" when the index passes 300, a reading between 101 and 200 is "unhealthy". The previous worst reading here was 226, in 1997.
A 23-agency haze task force met on Tuesday to coordinate plans to reduce the haze's impact on people.
Raging fires in Indonesia - some started by companies to clear the land of vegetation - have led to the haze here.
The National Environment Agency has published high-resolution satellite photos of hot spots or fires in the region and will update this daily. The hope is that it will help identify some of the firms responsible for starting the blazes.