Silver lining of Singapore's haze.

THE POLLUTANT STANDARDS INDEX (PSI), A measure of pollution levels for major air pollutants, reached a historical high of 401 in Singapore on 21 June, as a consequence of forest fires in Sumatra, Indonesia (1). A PSI between 101 and 200 is considered unhealthy; between 301 and 400 is hazardous to health; and above 400 is life-threatening to ill and elderly… CONTINUE READING