The National Environment Agency has continued to refuse citizen calls for it to provide 1-hour Pollutant Standards Index (PSI) readings, citing lack of health studies which allow the conversion of raw data into meaningful 1-hourly PSI readings.

NEA pollution control project director and chief scientific officer Indrani Rajaram said yesterday: “If tomorrow, there is a very rigorous health study that tells us that (there is a) one-hour PM2.5 concentration that is harmful, we will use that to do a conversion. But at the moment, studies out there don’t give you a number supported by health studies.”

PSI is calculated by inputting raw pollutant concentration data into a formula that takes into account breakpoints – upper and lower concentration limits derived from health studies – with a machine used by NEA to help measure the concentration of PM2.5 in the air.

The NEA has asked Singaporeans to use the 3-hour PSI readings to formulate their plans for daily activities instead.

Check Also

Can We Call Ourselves Fair When We Don’t Recognize LGBT Couples?

Min Shan tried to assure Singaporeans that sexual orientation do not influence policies. But why is 377A still around?