API vs PM2.5 Air Quality Monitoring Malaysia

Introduction

During haze episodes in Malaysia, many building managers, construction contractors, HSE Safety Officers and office occupants check the Air Pollutant Index (API) to understand outdoor air pollution conditions.

However, an official API reading is not the same as a PM2.5 measurement taken inside an office, factory or construction site building.

Understanding the difference between API, PM2.5 and AQI is essential when selecting an air quality monitoring instrument.

The Temtop M10i WiFi Air Quality Monitor provides local indoor PM2.5, HCHO and TVOC measurements, together with an instrument-generated AQI indication. Its WiFi connectivity and mobile application make it suitable for observing indoor air quality trends during haze events.

MTM Precision Sdn Bhd supplies Temtop air quality monitoring instruments for commercial, industrial and professional applications throughout Malaysia.

What Is the Air Pollutant Index (API) in Malaysia?

The Air Pollutant Index (API), also known as Indeks Pencemar Udara (IPU), is Malaysia's official indicator of ambient air pollution.

The Department of Environment (DOE) publishes API information through its Air Pollutant Index Management System (APIMS).

Malaysia's API considers monitored air pollutants according to the applicable national calculation methodology. The resulting index provides a standardised indication of outdoor air quality conditions.

Official API categories are:

0–50: Good

51–100: Moderate

101–200: Unhealthy

201–300: Very Unhealthy

Above 300: Hazardous

These values are index numbers, not particulate concentrations expressed in µg/m³.

Official API information is especially important for employers reviewing haze-related workplace precautions.

What Is PM2.5 and Why Does It Matter?

PM2.5 refers to airborne particulate matter with an aerodynamic diameter of 2.5 micrometres or smaller.

Fine particles may originate from regional haze, smoke, traffic emissions, industrial combustion and other pollution sources.

PM2.5 concentration is normally expressed in micrograms per cubic metre (µg/m³).

Unlike the official regional API, a portable PM2.5 monitor provides a reading for the air surrounding the instrument.

For example, an office with effective particle filtration may have a different PM2.5 concentration from the outdoor environment during the same haze event.

Local indoor monitoring can help building managers observe changes in particulate concentration and review the effectiveness of ventilation and filtration measures.

API vs PM2.5 vs AQI - Understanding the Differences

Official Malaysia API:

A government-published ambient air pollution index based on monitored pollutants and the applicable Malaysian calculation methodology. It is used for public air quality communication and relevant haze precautions.

PM2.5:

A measured or estimated concentration of fine particulate matter, normally expressed in µg/m³. It represents conditions at the monitoring location.

Device AQI:

An air quality indication generated by an individual instrument using its own measurement inputs and algorithm. Its scale or calculation method may differ from Malaysia's official API.

These three values must not be treated as interchangeable.

A PM2.5 reading of 200 µg/m³ does not automatically mean that the official Malaysia API is 200.

Likewise, an AQI number displayed by the Temtop M10i must not be described as the official DOE API or IPU reading.

Malaysia DOSH 2026 Haze Guidelines and Workplace Safety

Malaysia's Department of Occupational Safety and Health (DOSH) lists the Guidelines for the Protection of Employees Against the Effects of Haze at Workplaces, Second Edition 2026.

The guidelines address employer precautions and workplace risk management during haze conditions.

For construction and outdoor work, the guidance discusses additional precautions at elevated official API levels, including temporary suspension of specified earthworks and earth-moving activities at very unhealthy levels, visibility-related precautions for lifting operations, and restrictions on outdoor work during more severe conditions.

Employers should consult the complete official guidelines and assess the specific work activity before deciding on operational controls.

The Temtop M10i is not an official API monitoring station. Its local PM2.5 readings and device-generated AQI cannot independently determine whether a construction activity must stop under DOSH guidance.

For workplace safety decisions, official DOE API information and the relevant DOSH requirements remain essential.

Temtop M10i WiFi Air Quality Monitor Malaysia

The Temtop M10i is a compact indoor air quality monitoring instrument designed for continuous observation of selected environmental pollutants.

Its principal functions include:

PM2.5 fine particulate monitoring

HCHO formaldehyde measurement

TVOC total volatile organic compound measurement

Instrument-generated AQI display

WiFi connectivity

Compatible mobile application for current readings and historical trends

The M10i is particularly suitable for indoor monitoring in construction site offices, administrative offices, meeting rooms, building management offices and other occupied indoor environments.

It does not measure PM10 or CO2.

Customers requiring PM10 or CO2 should consider another instrument with those specific measurement capabilities.

Temtop M10i Technical Specifications

PM2.5 Sensor: Laser particle sensor

PM2.5 Measurement Range: 0–999 µg/m³

PM2.5 Resolution: 1 µg/m³

PM2.5 Stated Accuracy: ±10 µg/m³ at 0–100 µg/m³; ±10% at higher concentrations within the manufacturer's stated accuracy conditions

HCHO Sensor: Electrochemical

HCHO Measurement Range: 0–2 mg/m³

HCHO Resolution: 0.01 mg/m³

HCHO Stated Accuracy: ±0.03 mg/m³ at 0–0.3 mg/m³; ±10% at higher concentrations within the stated accuracy conditions

TVOC Measurement Range: 0–5 mg/m³

TVOC Resolution: 0.01 mg/m³

Battery Capacity: 2,200 mAh

Typical Battery Runtime: Approximately 6 hours after full charge

Dimensions: 82 × 82 × 31 mm

Weight: Approximately 200 g

Operating Environment: 0–50°C and 0–90% RH

Power Input: DC 5V, 0.5–1A

Connectivity: WiFi with compatible mobile application

Specifications are based on the published Temtop M10i product listing. Customers should confirm the supplied version, app compatibility and current manufacturer documentation before purchase.

Applications of Temtop M10i During Haze in Malaysia

1. Construction Site Offices

Temporary site offices may experience particle infiltration from outdoor haze, nearby traffic and construction activities. The M10i can provide indoor PM2.5 readings and help staff observe changing conditions.

2. HSE and Safety Department Offices

HSE personnel can monitor general indoor PM2.5 trends while consulting official API information separately for outdoor workplace precautions.

3. Factory Administration Offices

Industrial facilities may have offices located near production areas or vehicle routes. Indoor monitoring can help identify changes in local particulate conditions.

4. Meeting Rooms and Control Rooms

A WiFi-enabled monitor can help building operators observe indoor particulate trends over time without relying solely on occasional spot measurements.

5. Air Purifier Performance Checks

Users can compare PM2.5 readings before and after operating an air purifier under similar room conditions. Results are indicative and do not constitute a certified filtration efficiency test.

6. Renovated Site Offices

The M10i also provides HCHO and TVOC readings for general screening of indoor chemical pollutant trends associated with furnishings, adhesives and renovation materials.

How to Monitor Indoor PM2.5 with Temtop M10i

Step 1: Position the M10i inside the occupied room, away from direct air-conditioner airflow, open windows and concentrated pollution sources unless those locations are the intended test points.

Step 2: Ensure that the instrument's air inlets are unobstructed and that the operating environment is within the specified limits.

Step 3: Allow readings to stabilise according to the user manual.

Step 4: Connect the M10i to a compatible WiFi network and mobile application where remote viewing or historical trends are required.

Step 5: Observe PM2.5 trends during different room conditions, such as doors open, doors closed or air purifier operating.

Step 6: Compare readings over consistent monitoring periods rather than drawing conclusions from a single instantaneous measurement.

Step 7: Check official DOE API readings separately when evaluating outdoor haze conditions.

Do not expose the M10i to rain, condensation, excessive construction dust or other conditions beyond its specified operating environment.

Why WiFi Monitoring Is Useful for Offices

Air quality inside a building can change throughout the day.

Doors may open frequently, outdoor haze may enter through ventilation systems, and air purifiers may operate at different settings.

The Temtop M10i supports WiFi connectivity and compatible application-based viewing of current measurements and historical air quality trends.

This allows users to observe changes without standing beside the instrument continuously.

The monitoring information is useful for general environmental awareness and internal facility management. It should not be represented as certified occupational exposure monitoring or official environmental compliance data.

Temtop M10i vs Portable Construction Dust Monitors

The Temtop M10i is primarily intended for indoor air quality monitoring.

Its WiFi functionality makes it suitable for monitoring selected rooms and observing PM2.5 trends.

However, construction projects that require PM10 measurement, outdoor field inspection, heavy-dust monitoring or professional occupational exposure sampling may need different equipment.

For example, the Temtop M2000 2nd provides additional measurement parameters and a portable inspection-oriented design.

Instrument selection should be based on the intended environment, pollutants of interest, required accuracy, operating conditions and whether formal compliance measurements are necessary.

Frequently Asked Questions

Does Temtop M10i measure Malaysia's official API?

No. The M10i displays its own air quality indication. Official Malaysian API readings are published through DOE APIMS.

Can PM2.5 readings be converted directly into API?

No. Malaysia's official API calculation involves defined pollutants and averaging methodologies. A single instantaneous PM2.5 reading is insufficient to establish the official API.

Does the M10i measure PM10?

No. The M10i measures PM2.5 but does not provide a PM10 measurement.

Does the M10i measure CO2?

No. A separate CO2-capable instrument is required for carbon dioxide monitoring.

Can the M10i be used inside construction site offices?

Yes, for general indoor air quality monitoring when the environment is within the instrument's operating limits.

Can the M10i determine whether a construction site must stop work?

No. Construction site work restrictions must be assessed using official API information, applicable DOSH guidance and workplace risk assessments.

Does WiFi monitoring replace professional air quality testing?

No. WiFi monitoring provides convenient access to instrument readings and trends, but does not replace reference-grade monitoring or professional occupational hygiene assessment.

Where to Buy Temtop M10i in Malaysia

MTM Precision Sdn Bhd supplies Temtop M10i WiFi Air Quality Monitors for indoor air quality applications in Malaysia.

We assist customers from Kuala Lumpur, Selangor, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Kelantan, Terengganu, Perlis, Sabah and Sarawak.

For office haze monitoring, building management and HSE applications, customers can contact MTM Precision to discuss their required measurement parameters and operating conditions.

MTM Precision Sdn Bhd

Showroom & Service Centre

No. 29-1 & 29-2, Jalan Bandar 18,

Pusat Bandar Puchong,

47160 Puchong, Selangor, Malaysia.

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com

Website: www.mtmpre.com.my

Send your application details through WhatsApp for Temtop M10i product information and air quality monitoring assistance in Malaysia.

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Understand API vs PM2.5 in Malaysia, DOSH 2026 haze guidance and indoor monitoring with the Temtop M10i WiFi Air Quality Monitor from MTM Precision.