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Air quality is important for us since poor air quality would affect our health.


Many studies already pointed out that air pollutants can cause different types of disease especially heart and respiratory diseases. No matter at outdoor or indoor environment, we are surrounded by different types of air pollutants.

At 1987 the Hong Kong government has established an Air Quality Objective for outdoor environment while at 1999 the Hong Kong government has established an Indoor Air Quality Objective for offices and public places served by Mechanical Ventilation and Air Conditioning (MVAC) system.

Poor indoor air quality would cause Sick Building Syndrome (SBS); some of the symptoms for SBS include headache, throat irritation, itchy eyes and skin etc. We can improve the indoor air quality by checking the MVAC system, measuring the indoor pollutant level and minimizing the pollutant sources so that we can stay at a healthy and comfortable indoor environment.

Parameters of Air Quality Testing Method Equipment used
Temperature (T °C) Real-time monitor TSI Q-Trak IAQ Monitor
Relative Humidity (RH %)
Carbon Dioxide (CO2)
Carbon Monoxide (CO)
Respirable Suspended Particulate (RSP) TSI Personal Aerosol Monitor/AM510
Ozone (O3) Aeroqual Series 500 Monitor, with O3 Sensor
Total Volatile Organic Compounds (TVOC The ppb RAE parts per billion (ppb) volatile organic compound (VOC) Monitor
Radon (Rn) RAD7 Professional Radon Monitor
Air Movement Air Velocity Meter
Formaldehyde (HCHO)) Passive sampling SKC/Sampler: SKC - UMEX 100
Nitrogen Dioxide (NO2) Ogawa & Co./NO2 Ogawa Sampler
Airborne Bacteria Active sampling Microbial Air Sampler
Volatile Organic Compounds (VOCs) e.g.: Formaldehyde (HCHO), BTEX (Benzene, Toluene, Ethylbenzene & Xylene), etc. Sorbent tube with Low flow pump