How to Monitor CO2 in a Meeting Room Malaysia
How to Monitor CO2 in a Meeting Room Malaysia
A meeting room may feel perfectly comfortable when it is empty.
The air conditioner is running.
The temperature is cool.
There is no obvious smell.
But what happens after 8, 10 or 15 people enter the room and close the door for an hour?
This is where CO2 monitoring becomes useful.
For offices in Malaysia, meeting-room CO2 monitoring can help facility managers understand how occupancy and ventilation conditions change throughout meetings instead of relying only on complaints that a room feels “stuffy.”
A CO2-capable indoor air quality monitor such as the Temtop M10+ can be used to observe these changes over time.
Why Monitor CO2 in a Meeting Room?
Meeting rooms are different from normal open office areas.
They may remain empty for much of the day.
Then suddenly become highly occupied.
For example:
8:30 AM — Empty.
9:00 AM — 12 people enter.
9:05 AM — Door closes.
10:30 AM — Meeting ends.
10:35 AM — Everyone leaves.
11:00 AM — Another group enters.
This creates a constantly changing occupancy pattern.
CO2 monitoring helps you see how the room responds.
What Does CO2 Tell You?
People exhale carbon dioxide continuously.
When more people enter a room, the amount of CO2 being generated increases.
Whether indoor CO2 accumulates depends partly on factors such as:
Number of occupants.
Room volume.
Duration of the meeting.
Fresh-air ventilation.
HVAC operation.
Door and window conditions.
Building ventilation design.
CO2 monitoring therefore provides useful information about how an occupied room behaves under actual operating conditions.
Air Conditioning Is Not the Same as Ventilation
This is an important point for Malaysian offices.
A meeting room can be:
Cold
but still have:
Increasing CO2
Many air-conditioning systems are designed primarily to control temperature.
Fresh-air ventilation is a separate consideration.
Therefore, do not assume that a cold meeting room automatically has sufficient outdoor-air exchange for its occupancy.
Measure the actual room.
Step 1: Measure the Empty Room
Before evaluating a meeting, first understand the room under low-occupancy conditions.
Place the CO2 monitor in an appropriate representative location.
Allow it to stabilise according to the manufacturer's instructions.
Record the condition before people enter.
This becomes your starting point.
For example:
8:45 AM — Room empty.
9:00 AM — Meeting begins.
The comparison between these conditions is more informative than looking at only one isolated reading.
Step 2: Record the Number of Occupants
Occupancy is critical.
A room containing four people may behave very differently from the same room containing twelve people.
Record:
Number of people.
Meeting start time.
Meeting end time.
Door condition.
Any significant ventilation changes.
This gives context to the CO2 data.
Step 3: Observe the CO2 Trend During the Meeting
Do not focus only on one number.
Watch the pattern.
Ask:
Does CO2 begin increasing after people enter?
How quickly?
Does it stabilise?
Does it continue increasing?
What happens after 30 minutes?
What happens after one hour?
Does opening the door change the trend?
The shape of the trend can provide useful information about how the room responds to occupancy.
Step 4: Observe What Happens After the Meeting
When the meeting ends, everyone leaves.
Now continue monitoring.
This recovery period can be very informative.
Ask:
Does CO2 begin falling?
How quickly?
How long does the room take to approach its previous condition?
What happens before the next meeting begins?
A room used for back-to-back meetings may behave differently from one that remains empty for several hours between meetings.
Back-to-Back Meetings Are Worth Monitoring
Consider this schedule:
9:00–10:00 AM — Meeting A.
10:00–11:00 AM — Meeting B.
11:00 AM–12:00 PM — Meeting C.
1:00–2:00 PM — Meeting D.
If the room has limited recovery time between groups, its daily pattern may be different from a room used only once.
Historical monitoring makes these patterns much easier to identify.
Step 5: Compare Different Occupancy Levels
One of the most useful tests is to compare similar meetings with different numbers of people.
For example:
Meeting A — 4 people.
Meeting B — 8 people.
Meeting C — 12 people.
Meeting D — 16 people.
Keep a simple record.
Then compare the CO2 trends.
This can help facility management understand how room occupancy affects the indoor environment.
Step 6: Compare Different Meeting Rooms
Suppose your office has four meeting rooms.
Room A — Small.
Room B — Medium.
Room C — Large.
Room D — Boardroom.
Do they behave the same way?
Not necessarily.
Different rooms may have different:
Volumes.
Ventilation arrangements.
Air-conditioning systems.
Door usage.
Occupancy patterns.
A monitor can be used to investigate these differences.
One Monitor Can Be Used for Initial Room Comparison
If the company is still evaluating the issue, one portable or movable monitor may be used for an initial comparison.
For example:
Monday — Room A.
Tuesday — Room B.
Wednesday — Room C.
Thursday — Boardroom.
Friday — Repeat the room showing the most interesting pattern.
This provides an initial picture before deciding whether continuous monitoring is needed in several locations.
Where Should You Place the CO2 Monitor?
Placement matters.
Avoid locations that may distort the measurement.
Do not place the monitor:
Directly beside a person's face.
Immediately beside an open door.
Directly under an air-conditioning outlet.
Directly beside an open window.
Inside a cabinet.
Immediately beside an unusual local source.
Choose a representative occupied-zone location and follow the instrument manufacturer's placement recommendations.
Why You Shouldn't Put It in the Middle of the Meeting Table Beside Someone
This may seem convenient.
But if the sensor is immediately beside a participant who is speaking and breathing toward it, the measurement can be influenced by exhaled breath.
The objective is to understand the room condition, not one person's breath.
Choose the location carefully.
PM2.5 Also Matters in Malaysian Offices
CO2 is not the only indoor air parameter that may matter.
During haze, PM2.5 can become another concern.
A meeting room may therefore present two separate questions:
Is the ventilation adequate for occupancy?
and:
How much particulate pollution is present indoors?
These questions require different measurements.
A multi-parameter monitor can help observe both.
Example: Meeting Room During Haze
Imagine outdoor air quality is poor.
The office keeps doors and windows closed.
An air purifier is operating.
Indoor PM2.5 begins decreasing.
Ten people enter the meeting room.
After one hour:
PM2.5 may remain controlled.
But CO2 may have increased.
This does not mean the air purifier failed.
The purifier and ventilation system are addressing different problems.
What About TVOC?
Meeting rooms can also contain:
New furniture.
Carpet.
Wall finishes.
Cleaning products.
Renovation materials.
Other indoor sources.
If VOC-related changes are a concern, TVOC monitoring can provide another layer of information.
However:
TVOC is not the same as dedicated formaldehyde measurement.
If HCHO is specifically required, use an appropriate HCHO-capable instrument.
Why Temtop M10+ Fits Meeting Room Monitoring
The Temtop M10+ combines several useful indoor environmental parameters, including:
CO2
PM2.5
TVOC
AQI
Temperature
Humidity
This allows facility teams to investigate several questions from the same room.
For example:
CO2 → occupancy and ventilation trend.
PM2.5 → particulate conditions.
TVOC → general VOC trend.
Temperature → thermal conditions.
Humidity → moisture conditions.
Instead of receiving only a complaint that “the room feels bad,” facility management has data to investigate.
A Simple Meeting Room Test Plan
A practical initial test can be structured like this:
Before Meeting
Record:
Time.
CO2.
PM2.5.
Temperature.
Humidity.
Number of occupants: 0.
Meeting Starts
Record:
Number of occupants.
Door condition.
Start time.
During Meeting
Observe the trend at practical intervals.
For example:
15 minutes.
30 minutes.
60 minutes.
End of meeting.
After Meeting
Continue monitoring.
Observe the recovery trend.
Repeat
Repeat the test with:
Different occupancy.
Different meeting duration.
Different room.
This creates useful comparative information.
Don't Draw Conclusions from One Meeting
One meeting may not represent normal building operation.
Conditions can change because of:
Different occupancy.
Different HVAC schedules.
Different outdoor conditions.
Different door usage.
Different time of day.
Different building operation.
For a more useful picture, observe several comparable periods.
Patterns repeated across multiple days are more informative than one unusual event.
Can CO2 Monitoring Replace a Formal IAQ Assessment?
No.
A consumer or general-purpose indoor air quality monitor can be useful for:
Screening.
Trend observation.
Room comparison.
Identifying patterns.
Investigating complaints.
But where a formal workplace, regulatory or professional indoor air quality assessment is required, appropriate procedures, qualified personnel and suitable professional instruments may be necessary.
Use the monitor according to its intended purpose.
When Should Facility Management Investigate Further?
If repeated monitoring shows an unusual or persistent pattern, facility management may consider investigating:
Fresh-air supply.
HVAC operation.
Room occupancy.
Ventilation design.
Air distribution.
Maintenance condition.
Operating schedules.
For complex building issues, appropriate HVAC, ventilation or indoor environmental professionals may be required.
The monitor helps identify the pattern.
It does not replace building engineering diagnosis.
Meeting Room CO2 Monitoring for Malaysian Offices
CO2 monitoring can be particularly useful in:
Corporate offices.
Meeting rooms.
Boardrooms.
Conference rooms.
Training centres.
Co-working spaces.
Private offices.
Discussion rooms.
Tuition and training facilities.
Any enclosed space where occupancy changes significantly throughout the day can benefit from better understanding of its environmental pattern.
How to Monitor CO2 in a Meeting Room Malaysia
A useful process is:
Measure the empty room.
Record occupancy.
Monitor during the meeting.
Observe the recovery period.
Compare different occupancy levels.
Compare different rooms.
Repeat the test.
This approach provides much more useful information than taking one random CO2 reading.
For facility teams wanting to monitor CO2 together with PM2.5, TVOC, temperature and humidity, the Temtop M10+ provides a convenient multi-parameter solution for indoor environmental observation.
Contact MTM Precision
MTM Precision Sdn. Bhd. (744811-A)
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
Telephone: +603-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com / enquiry@mtmpre.com.my
Website: www.mtmpre.com.my
Contact MTM Precision for Temtop M10+ CO2 Monitor Malaysia, quotation and assistance with indoor air quality monitoring equipment for meeting rooms, offices, classrooms, training rooms and other occupied indoor spaces.
19 Sep 2026
