[UPDATED 19 June, 8:00PM: PSI index hit 190, the highest since 1997 and nearing the ‘very unhealthy’ range]
The Pollutant Standards Index (PSI) on Wednesday hit as high as 190, the highest since the record peak of 226 in 1997. The level is still in the “unhealthy” range of 101-200 but is getting closer to the “very unhealthy” range of 201-300.
Please stay indoors!!!
See on sg.news.yahoo.com