Singapore—The National Environment Agency (NEA) said on September 10, Tuesday, that if the haze in Sumatra worsens, it is possible that the Pollutant Standards Index (PSI) in the country may enter the unhealthy range. By 8:00 on the evening of September 10, the 24-hour PSI was still in the moderate range, which is between 85 and 96. … Continue reading NEA warns air quality in Singapore may become ‘unhealthy’ if fires in Indonesia continue