1. WHAT IS YOUR INDOOR AIR QUALITY LIKE?
In the first flat Ser visited, where the air quality was worse than outdoors, the windows were open in the morning before the resident closed them.
“It’s entirely possible that the windows were closed … (when) the PM2.5 levels were higher, thereby trapping the polluted air,” said Nanyang Technological University (NTU) assistant professor Leonard Ng, who used a professional-grade air quality monitor to record the measurements.
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