Air quality in Singapore has deteriorated significantly, with the 24-hour Pollutant Standards Index (PSI) reaching "very unhealthy" levels in the western region. As of 8am today, the PSI reading in western Singapore registered 207, indicating substantial air pollution. This haze is impacting all regions of Singapore, with PM2.5 readings also elevated nationwide. The situation is causing concern for public health, particularly for vulnerable groups. Residents are advised to limit outdoor activities and take necessary precautions. Authorities are monitoring the situation closely and providing updates to the public regarding the haze conditions in Singapore. The source of the haze is currently attributed to land and forest fires in neighboring Sumatra, Indonesia.