Air quality in Singapore has improved, returning to moderate levels across all regions after a period of haze. The Pollutant Standards Index (PSI) reached a peak of 164 on September 29th. This indicates a lessening of the unhealthy air conditions previously experienced. While the situation has improved, residents are still advised to monitor air quality updates and take necessary precautions if they are sensitive to haze. Authorities continue to monitor the situation closely and are prepared to provide further advisories as needed. The improvement is a relief to many after concerns raised by the recent spike in pollution levels. The National Environment Agency has not released information about the source of the haze.