Tag Archives: PM 2.5

Singapore Haze: How dangerous is PM 2.5?

While the National Environment Agency (NEA) has traditionally reported the Pollutant Standards Index (PSI) which measures the concentration of Particulate Matter less than 10 microns in size (PM 10), experts over the years have been warning that the smaller particles smaller than 2.5 microns or PM 2.5 are actually more dangerous to health. The physiological […]