Haze watch: Air quality in Singapore improves overnight, returns to moderate range
Residents in Singapore can breathe easier again after air quality returned to the moderate range overnight.The 24-hour Pollutant Standards Index (PSI) turned unhealthy in central Singapore at 9pm on Thursday night, with about four hours in that range.At 9am on Friday (Sept 18), the 24-hour PSI ranged between 70 and 97 — placing Singapore's overall air quality in the moderate range — with the highest PSI of 97 recorded in central Singapore.The next highest PSI reading of 90 was recorded in western Singapore.Meanwhile, one-hour PM2.5 at 9am was between 12 and 22, with the highest reading of 22 recorded in central Singapore.Readings of between 0 and 55 denote the normal band. Forecast till Friday eveningIn its daily haze situation update on Thursday evening, the National Environment Agency (NEA) said the country's 24-hour PSI forecast is expected to be in the high moderate to low unhealthy range.