of 3-hour psi 290 (very unhealthy)

The three-hour Pollutant Standards Index (PSI) reading soared to 290 at 9pm on Wednesday, setting a new all-time high and almost hitting hazardous levels of 301 and above. The last reading clocked at 8pm was 190, which was still in the "unhealthy" range. An hour later, however, the reading jumped 100 points to 290, entering the "very unhealthy" range.



Read more (S'pore PSI hits all-time high)

3-hour PSI is 290. Issued 9pm. http://t.co/jWFeoz49pP

— NEA (@NEAsg) June 19, 2013

Haze in Singapore hits historical high, PSI at 290