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Environment, Health & Safety Services

Indoor Air Quality Assessment

Indoor Air Quality Assessment

(Registered IAQ Assessor with Malaysia Department of Occupational Safety & Health : JKKP HIE127/171- 4/5)

As the public recognizes the importance of healthy, comfortable, and productive indoor environments, their awareness and demand for good indoor air quality (IAQ) increases. This demand has resulted in IAQ emerging as a major concern in office buildings. Many office buildings have significant indoor air pollution sources. Factors contributing to indoor air pollution include presence of indoor air pollutants, improper designed and poor maintenance or operation of air-conditioning system, insufficient air exchange and fresh air intake, used of building materials and furnishings and other indoor activities.


Good Indoor Air Quality (IAQ) is desired for a healthy indoor environment. Poor indoor air quality can cause variety of health problems ranging from temporary to long term. Health problems commonly associated with poor IAQ include allergic reactions, respiratory problems, tiredness, eye irritation, sinusitis, bronchitis and pneumonia.


IAQ problems arise in indoor or enclosed work space that is served by a ventilating and air-conditioning system where there are person at work. It does not include premises that are used primary as manufacturing and production facilities and vehicles) when there is an inadequate quantity of ventilation air being provided for the amount of air contaminants present in that space. Hence, IAQ and mechanical ventilation and air-conditioning systems (MVAC) are closely related.

What Is IAQ

IAQ is defined in terms of freshness and cleanliness of the air for the indoor occupants. ASHRAE has defined acceptable IAQ as "air in which there are no known contamination at harmful concentrations as determined by cognizant authorities and with which a substantial majority (80% or more) of the people exposed do not express dissatisfaction". The World Health Organisation (WHO) has used a broader definition “the physical and chemical nature of indoor air, as delivered to the breathing zone of building occupants, which produces a complete state of mental, physical and social well-being of the occupants, and not merely the absence of disease or infirmity

Our Capability/ Competent Person

Our IAQ competent person is registered and certified by Malaysia Department of Occupational Health & Safety (DOSH) and possesses extensive experience in the investigation of IAQ problems in commercial buildings, office premises, hospitals, hotels and industrial office premises. Our IAQ team is highly specialized group, which has unique capability with specialized instrumentation of providing IAQ testing consultation, on site IAQ investigations and evaluation.

Indoor Air Quality Assessment

(Registered IAQ Assessor with Malaysia Department of Occupational Safety & Health : JKKP HIE127/171- 4/5)

Our Indoor Air Quality specialists and engineers have extensive experience in the investigation of IAQ problems in commercial buildings, office premises, hospitals, hotels and industrial plants. The team is a highly specialized group, which has unique capability with specialized instrumentation of providing IAQ testing consultation, on-site IAQ investigations and evaluation.



Scope of work includes:
  • Walk through inspection with specific instrument and data collection
  • Survey Questionnaire
  • Results compilation, evaluation of the test results and proposed recommendation, where relevant
  • Reporting
  • IAQ Abatement Consultancy

Methodology and Standard References:
  • Walk through inspection with specific instrument and data collection
  • Survey Questionnaire
  • Results compilation, evaluation of the test results and proposed recommendation, where relevant
  • Reporting
  • IAQ Abatement Consultancy



S/No Parameter Malaysia - DOSH Industry Code
of Practice on IAQ 2010
*ASHRAE IAQ Guidelines
1 Temperature (oC) 23-26 22-24
2 Relative Humidity (%) 40-70 40-60
3 Carbon Dioxide (ppm) C1,000 700 > outdoor air
4 Carbon Monoxide (ppm) 10 9
5 Formaldehyde (ppm) 0.1 0.12
6 Ozone (ppm) 0.05 0.12
7 Respirable Suspended Particulate (mg/m3) 0.15< /td> 150
8 Total Volatile Organic Compounds (ppm) 3 4
9 Total Bacteria Count (CFU/m3) 500 500
10 Total Yeast & Moulds (CFU/m3) 1000 500
11 Air Movement (m/s) 0.15-0.50
Physical Parameters
  • Air Temperature (oC)
  • Relative Humidity (%)
  • Air Movement (m/s)


Chemical Contaminants
  • Carbon Monoxide (ppm)
  • Formaldehyde (ppm)
  • Ozone (ppm)
  • Respirable Particulate, less than10 um
  • Total Volatile Organic Compounds (ppm)



Biological Contaminants
  • Total Bacterial Counts (CFU/m3)
  • Total Fungal Counts (CFU/m3)



Ventilation Performance Indicator
  • Carbon Dioxide (ppm)