Indoor Air Quality (IAQ) Assessment in Johor Bahru
Assessment of air-conditioned workplaces under DOSH's ICOP on Indoor Air Quality 2010 — conducted by a DOSH-registered IAQ assessor, with the causes traced and fixed.
Headaches, stuffiness and the air-conditioning
The Industry Code of Practice on Indoor Air Quality 2010 applies to workplaces served by mechanical ventilation and air-conditioning — offices, control rooms, training rooms, laboratories and other enclosed spaces where people work, including those cooled by split units.
Poor indoor air rarely announces itself. It shows up as headaches, drowsiness after lunch, irritated eyes, a musty smell in one corner, or a run of complaints after a renovation. The usual causes are not exotic: too little fresh air for the number of people, MVAC maintenance that has slipped, wet drip trays, or new furnishings and materials off-gassing.
Our IAQ assessments are conducted by a DOSH-registered IAQ assessor. ProSafe manages the walkthrough, coordinates the assessment, and works with your facilities team on the fixes for workplaces across Johor Bahru, Pasir Gudang, Tebrau, Senai, Kulai and Iskandar Puteri.
Walkthrough Inspection
Occupants, MVAC system, pollutant sources and pathways reviewed before any measurement.
IAQ Assessment
Physical, chemical and biological parameters measured by a DOSH-registered IAQ assessor, with an occupant symptom survey.
MVAC Maintenance Review
Inspection, cleaning and drip tray routines checked against what the ICOP expects.
Corrective Action
Causes identified and resolved with your facilities team, then reassessed.
Key acceptable limits
Temperature & humidity
Air temperature 23–26 °C and relative humidity 40–70%.
Air movement
0.15–0.50 m/s — enough to avoid stagnant air, not so much that it causes draughts.
Carbon dioxide
1,000 ppm ceiling. Readings above it indicate inadequate ventilation for the occupancy.
Chemical contaminants
Carbon monoxide 10 ppm and formaldehyde 0.1 ppm, as eight-hour time-weighted averages.
Respirable particulates
0.15 mg/m³ — dust and fine particles small enough to reach the lungs.
Biological contaminants
Total bacteria 500 cfu/m³ and total fungi 1,000 cfu/m³ — indicators that trigger further investigation.
Is this you?
- Occupants are complainingabout stuffiness, headaches, odours or irritation in an air-conditioned area.
- Headcount has grownbeyond what the office or control room was designed to ventilate.
- You have renovated— new partitions, furniture, carpet or a change to the MVAC layout.
- There is visible mould or dampnear diffusers, ceiling tiles or air-handling units.
- A customer or certification auditasked for evidence of IAQ management.
Find the cause, not just the reading
A report that says carbon dioxide is high in the meeting room is a measurement. The useful answer is why — fresh air dampers closed to save energy, an air-handling unit sized for half the current headcount, or a filter that has not been changed in a year.
We start with a walkthrough, because the code expects obvious causes to be fixed straight away without waiting for measurement. Where the cause is not obvious, the assessment is conducted by a DOSH-registered IAQ assessor and reported within one month.
ProSafe then works through the findings with your facilities team or MVAC contractor, aiming to act within the one month the code expects for unacceptable results, and sets up the inspection and cleaning routine that keeps the air within limits afterwards.
How an IAQ assessment runs
Walkthrough
Occupancy, MVAC system, sources and complaints reviewed; obvious causes addressed immediately.
Assessment
Measurement of physical, chemical and biological parameters by a DOSH-registered IAQ assessor, with an occupant symptom survey.
Report & Causes
Results compared against the ICOP limits, with the likely cause of each exceedance identified.
Corrective Action
Fixes implemented with your facilities team, MVAC maintenance routine set, and reassessment arranged.
Indoor air quality — common questions
Which workplaces does the ICOP on Indoor Air Quality 2010 cover?
Buildings or enclosed areas where people work that are served by a mechanical ventilation and air-conditioning (MVAC) system, including split units. That typically means offices, control rooms, laboratories not using hazardous chemicals, training rooms and similar spaces. Domestic buildings and industrial process areas are outside its scope; process areas are dealt with under other regulations such as USECHH — see CHRA.
Who can conduct an IAQ assessment?
An indoor air quality assessor registered with the Director General of DOSH. Our IAQ assessments are conducted by a DOSH-registered IAQ assessor, with ProSafe managing the walkthrough, scheduling and corrective action.
When is an IAQ assessment needed?
The code expects the owner or management to investigate when occupants complain, when occupancy exceeds what the space was designed for, or when renovation significantly changes ventilation. Where a walkthrough does not find an obvious cause, a full assessment by a registered assessor follows.
What are the acceptable limits?
Among the parameters in the ICOP: air temperature 23–26 °C, relative humidity 40–70%, air movement 0.15–0.50 m/s, carbon dioxide 1,000 ppm as a ceiling that indicates ventilation adequacy, carbon monoxide 10 ppm, formaldehyde 0.1 ppm, respirable particulates 0.15 mg/m³, total bacterial count 500 cfu/m³ and total fungal count 1,000 cfu/m³. Chemical limits are eight-hour time-weighted averages.
What happens after the assessment?
The assessor submits the report within one month of completing the assessment, and where results are unacceptable the code expects action to be taken within one month of receiving it. We work through the causes with your facilities team — commonly fresh air intake, MVAC maintenance, filter and drip tray cleaning, or occupancy — and arrange reassessment.
Where we work
We arrange IAQ assessments for factory offices, control rooms and commercial workplaces across Johor Bahru, Pasir Gudang, Tebrau, Plentong, Masai, Skudai, Senai, Kulai, Iskandar Puteri and Gelang Patah, scheduled during normal occupancy so the results reflect real conditions.
Complaints about the air?
Tell us the area, the headcount and what people are reporting. We will tell you whether a walkthrough or a full assessment is the right first step.