The Gas Metrology Laboratory develops, maintains and disseminates gas and particle metrology related national measurement standards in Singapore. NMC has set up and is continuously improving national standards through R&D activities in this area to better meet the need of the industry. We have also participated in international comparisons to ensure our gas and particle standards are equivalent to those of other countries.


NMC has developed new capabilities on the gas metrology area:

  • NMC is developing new measurement method for the determination of polymer bio-degradability.
  • NMC has improved Archimedes method for better accuracy density measurement for 3D printed parts.
  • Particle mass, size and shape measurement capabilities for liquid suspension, powder and aerosol form particles.
  • Airborne particle count measurement capabilities for calibration of counting efficiency of particle counters which is used for air quality and clean room monitoring. The coverage is up to 5 micron in particle diameter, with expanded uncertainty of 4% - 9%.
  • Precise measurements of stable isotope of carbon, nitrogen, sulphur, oxygen, and hydrogen using stable Isotope Ratio Mass Spectrometer (IRMS) system. The IRMS system can be used for identifying sources of air pollutants and greenhouse gases, compounds of natural gases, and providing fingerprint for food authenticity and food integrity.


The Gas Metrology Laboratory develops, maintains and disseminates gas related national measurement standards and gas related Primary Reference Material (PRM) and Certified Reference Materials (CRM)  in Singapore in the areas of automotive gases, greenhouse gases, natural gases, ground level ozone, element isotope analysis, purity analysis, etc. These measurement standards are also developed for measurement and verification of related gas sensors and analysers for indoor/outdoor air quality, industry emission and climate change monitoring. These standards are derived from base unit of mole. Meanwhile, Gas Metrology Laboratory also built up the measurement capabilities of particle mass, shape and size, particle count and isotope analysis.

Certified Reference Materials

Ozone Analyser

Gas Sensor and Analyser

Purity Analysis

Particle Measurement

Chemical and Material Characterization



The Gas Metrology Laboratory provided training course on measurements Indoor Air Quality which is based on SS 554 requirements and Green Building’s requirements. Participants could gain the concepts and practical knowledge in parameters and measurements of Indoor Air Quality, including suitable IAQ equipment selection, IAQ equipment calibration, measurement methods, gas mixture standards needed, uncertainty evaluation. The training also provided an opportunity of to participants for onsite training of gas analysis and IAQ equipment calibrations in gas lab.

Trainings conducted in the past:

  • MAP course Gas analysis


NMC is currently the observer in the Consultative Committee for Amount of Substance – Metrology in Chemistry (CCQM) and also the active member in the Asia Pacific Metrology Programme (APMP) Technical Committee and Gas Analysis Working Group (GAWG) for preparation and analysis of gas mixtures. To ensure the metrological traceability, recent years the Gas Metrology Laboratory participated in international comparisons as shown in the below table.

International measurement standards:

  • BIPM ongoing Key Comparison (Ozone at ambient level from 0 to 500 nmol/mol)
  • EURAMET International Comparison (Carbon dioxide at 3 × 10-2 mol/mol)
  • BIPM ongoing Key Comparison (Ozone at ambient level from 0 to 500 nmol/mol)
  • APMP supplementary comparison on Methane (CH4) at 2000 ppm Concentration
  • APMP supplementary comparison of oxygen in nitrogen at 0.2 mol/mol level
  • APMP comparison of 1000 ppm propane in nitrogen
  • APMP supplementary comparison 100 ppm Carbon Monoxide in nitrogen
  • APMP supplementary comparison 1000 ppm Carbon Dioxide in nitrogen
  • BIPM ongoing Key Comparison (Ozone at ambient level from 0 to 500 nmol/mol)
  • COOMET key comparison of Carbon dioxide in Air at urban level (480‐800) µmol/mol



The Gas Metrology Laboratory carries out R&D and consultancy for industry and IHLs to develop and apply gas and gas sensor measurement techniques for the applications including industry pollutions, air quality, green building, workplace safety, additive manufacturing and gas leakage, etc.

Some of the projects in GL laboratory:

  • Chemical Metrology Program
  • Photonic Gas Sensor
  • Real-time Monitoring and Characterization of Particle Count and Indoor Environmental Environmental Quality with Integrated Low-cost Sensors
  • Development of Chip-scale Mid-IR Photonics Gas Sensor for Indoor Air Quality Monitoring 
  • Mechanical and Fatigue Characteristics of 3D printed Titanium Implants
  • Mechanical and Fatigue Characteristics of 3D Printed Polymeric Prosthetics for Medical Applications
  • MSC Exosome Characterization
  • Sensitivity of Thermal Camera for Hydrocarbon Gas



What is good ozone and bad ozone?

The good ozone is the stratospheric ozone layer occurring in the upper atmosphere, which extends from about 6 km to 50 km above the earth’s surface. The good ozone protected us from the sun’s harmful ultraviolet (UV) radiation. The bad ozone is the ground-level ozone in the troposphere, which is harmful to human and plants. Bad ozone is created when primary pollutants, such as nitrogen oxides and volatile organic compounds, react in the presence of sunlight.