LAST Friday, Singapore's three-hour Pollutant Standards Index surged to a record high of 401, just a day after hitting a previous record of 371.

On Saturday, the PSI fell sharply down to sub-200 levels, much to the relief of Singaporeans, as the winds changed direction and took the haze northwards.

The PSI has since fallen to 'moderate' levels this week, but ministers and experts have warned that that the haze is likely to persist for some time, as Indonesia's dry season ends only in September.

The satellite images above shows the dramatic difference between the air last Friday compared to today. The June 21 image was taken by Nasa's Terra satellite at 11.20am, when the PSI in Singapore was at its highest. Today's image was taken at 11.25am.

You can drag the handle on the graphic to the left or right to compare how the haze and cloud cover has changed from a week ago.