IAQ Test (General)

Our comprehensive indoor air quality (IAQ) test is suitable for general household and institutional clients. The test includes the most common air problems such as respirable suspended particulates, volatile organic compounds, formaldehyde, nitrogen dioxide, ozone and carbon dioxide. By conducting our in-depth air test, it enables us to analyze the quality of indoor air and the sources of pollution. Then we will address needed solutions to deal with the indoor air pollution. 

Measurement Items


PM with particle sizes less than 10 microns, which are known as respirable suspended particulates or PM10, can get deep into the lungs and cause a broad range of health effects, in particular, respiratory and cardiovascular illnesses.


PM0.3 refers to as ultra fine particles in the air as small as 0.3 microns in diameter, only 1/200 the diameter of hair. PM0.3 can penetrate through lung directly into the bloodstream, causes great impact on our health.


Total Volatile Organic Compounds (TVOCs) are a large group of chemicals that are found in many products we use to build and maintain our homes. Once these chemicals are in our homes, they are released into the indoor air we breathe. They may or may not be able to be smelled, and smelling is not a good indicator of health risk.

Ozone (O3)

Ozone is a molecule composed of three atoms of oxygen. When inhaled, ozone can damage the lungs. Relatively low amounts can cause chest pain, coughing, shortness of breath and throat irritation. Ozone may also worsen chronic respiratory diseases such as asthma and compromise the ability of the body to fight respiratory infections.


Either too hot or too cold room temperature can make people feel discomfort and sick. As matter of fact, temperature does play a critical role to our health being. 


Fine particulate matter (PM2.5) is an air pollutant that is a concern for people's health when levels in air are high. PM2.5 are tiny particles in the air that reduce visibility and cause the air to appear hazy when levels are elevated.

Formaldehyde (HCHO)

Formaldehyde is a colorless, flammable gas at room temperature and has a strong odor. Exposure to formaldehyde may cause adverse health effects. Formaldehyde can cause irritation of the skin, eyes, nose, and throat. High levels of exposure may cause some types of cancers.

Carbon Dioxide (CO2)

If the indoor CO2 level exceeds 1000 ppm (parts per million), it means that the ventilation rate is too low and it would cause unpleasant feeling and fatigue . At the same time, it represents some airborne pollutants such as suspended particles, virus, bacteria and volatile organic compounds are accumulating causing health concern.

Nitrogen Dioxide (NO2)

NO2 primarily gets in the air from the burning of fuel. NO2 forms from emissions from cars, trucks and buses, power plants, and off-road equipment. NO2 is an important air pollutant because it contributes to the formation of photochemical smog, which can have significant impacts on human health.


Humidity is an important indoor air quality parameter. High humidity will promote grow of molds and fungi as well as virus and bacteria in the indoor area.

Test Content Overview

We use multiple state-of-art measuring instruments to measure accurate reading for each item. We provide users with on-site measurement reports and compare with the air quality standard provided by World Health Organization and the Hong Kong Environmental Protection Department for reference. Also, we will propose suitable solutions for the users according to the actual situation. The test includes the following measurement items:
  1. PM10
  2. PM2.5
  3. PM0.3
  4. Formaldehyde (HCHO)
  5. Total Volatile Organic Compounds (TVOCs)
  6. Carbon Dioxide (CO2)
  7. Temperature
  8. Humidity
Need further quote:
  1. Ozone (O3)
  2. Nitrogen Dioxide (NO2)


  • World Health Organization (WHO) guidelines for air quality

  • Hong Kong Environmental Protection Department (EPD) guidelines for indoor air quality

Pricing Details

  • Residential: HK$1500
    • Measure 5 sampling points (such as living room, bedroom, bathroom, kitchen)
    • $200 for each additional sampling points
    • Instant reports
    • Consultation and solutions
  • Business and Institutions: HK$2800
    • Measure 5 sampling points 
    • $250 for each additional sampling points
    • Instant reports
    • Consultation and solutions
    • In-depth test report
Time require
  • Approximately 1 hour
    (The actual time may vary, depend on measuring area or numbers of sampling points)
  • Please close all the doors and windows
  • Do not open the closets and drawers
  • To prevent indoor air convection, please close all the doors
(It is recommended to comply all the above steps 12 hours before the test)
Target client
  • Residential
  • Commercial buildings
  • Schools and educational institutions
  • Government agencies
  • Non-profit-organizations

Make an Appointment

If you want to find out more about our Indoor Air Quality Test service, please contact us for inquiry and we will be happy to help you. You can also submit a form to arrange an appointment for this service.