Air quality in three regions of Singapore started the day in the unhealthy range on Saturday (Sep 5), before improving as the day progressed.

The 24-hour PSI in the central region crossed the unhealthy threshold of 101 at 7am, before steadily rising throughout the day.

From Friday (Sep 4) evening, NEA's daily haze advisories will include the 24-hour PSI forecast to help the public plan activities and events for the next 24 hours.