Indoor Air Quality Audit based on Singapore National Environment Agency (NEA) Guidelines

The indoor air quality of air-conditioned offices is a subject of public health importance because most of us spend a substantial amount of time in such premises. Good indoor air quality can lead to improved productivity at the workplace. On the other hand, poor indoor air quality will cause productivity to drop because of comfort problems, short and long term debility and sickness.

Maximum Threshold Limits for potential indoor air contaminants, as published in the Singapore NEA "Guidelines for Good Indoor Air Quality in Office Premises"
  • Test Parameter Info Maximum Threshold Limit
  • Carbon Dioxide (CO2)  1000 ppm
  • Carbon Monoxide (CO)   9 ppm
  • Formaldehyde (HCHO)  0.1 ppm
  • Ozone (O3)  0.05 ppm
  • Total Volatile Organic Compounds (TVOC)  3 ppm
  • Suspended Particulate Matter   150 µg/m3
  • Air Temperature   22.5°C – 25.5°C
  • Relative Humidity   ≤70%
  • Air Velocity   ≤0.25m/s
  • Total Bacterial Counts   500 Cfu/m3
  • Total Fungal Counts   500 Cfu/m3
Indoor levels of air pollutants can be 2-5 times higher, and occasionally 100 times higher, than outdoor levels. IAQ's expertise is in identifying and eliminating environment -related reactions or allergies.




To read more on Indoor air quality and environmental health issues, please click on the following link: More on Indoor air quality Singapore