Air quality in central Singapore has improved, returning to moderate levels as of 11pm. The 24-hour Pollutant Standards Index (PSI) reading reached 100, slightly down from 101 recorded the previous hour. This indicates a lessening of haze or pollutant concentration in the air. While still categorized as moderate, the dip suggests conditions are improving. Authorities in Singapore continue to monitor air quality closely. Residents are advised to stay informed on the latest PSI readings. The improvement offers some relief after recent periods of potentially higher pollution levels.