It's only been a few months into the year and already our hazy days have been slowly seeping in once again as the 3-hour Pollutant Standards Index (PSI) peaked at 87 yesterday night — the highest yet this year.
Though PSI levels tapered down slightly since the peak, the air quality hasn't let up, remaining on the high end of 'moderate' range since yesterday. According to the World Air Quality Index Project's real-time calculations, the concentration of fine particulate matter (PM2.5) have even breached into the 'unhealthy' range as of writing.