Haze watch: PSI enters high-unhealthy range in southern, western and central Singapore

Air quality in the Republic has deteriorated overnight, just as Singapore enters the Formula 1 Singapore Grand Prix race weekend. At 10am on Friday (Oct 9) morning, the 24-hour Pollutant Standards Index (PSI) was in the high-unhealthy range in the central (173), western (166) and southern (154) regions, while eastern (147) and northern (117) Singapore are in the mid-unhealthy range. Meanwhile, one-hour PM2.5 is in the elevated band across Singapore, with central Singapore jointly recording the highest reading of 142.On Thursday night, the concentration reading hit the high-band in three regions — western (156), central (163) and eastern (152) Singapore — simultaneously.In its daily haze situation update on Thursday evening, the National Environment Agency (NEA) said it expects the country's 24-hour PSI to be in the high-moderate to mid-unhealthy range.