Client Area


Emissions monitoring

Industrial processes which emit to atmosphere do so under permit granted by the Environment Agency or the Local Authority. The permit would define the permissible limits for the various pollutants emitted by the process.

Some processes may have continuous emissions monitoring systems (CEMS) installed providing real time data on the emissions whilst other processes would be subject to periodic testing. In both cases independent testing of emissions is a requirement of the permit. The company undertaking third party testing is required to have accreditation by the United Kingdom Accreditation Service (UKAS) to ISO 17025 and CEN/TS 15675 and also be accredited by UKAS under the Environment Agency Monitoring Certification Scheme (MCERTS). Personnel who conduct the tests must be accredited to the scheme.

CES Environmental Instruments Ltd has held UKAS Accreditation for many years and gained MCERTS Accreditation shortly after the scheme was introduced. Many of our engineers have attained MCERTS Level 2 status (team leader) with the full range of technical endorsements. (TE1, TE2, TE3 and TE4).

The current schedule defining the substances and parameters for which we are accredited is to be found on the UKAS website, click here.
The substances include the following: -

Particulates Hydrogen Fluoride
Water Vapour  Metals
Sulphur Dioxide Carbon Dioxide
Polycyclic Hydrocarbons (PAHs) Propane
Dioxins and Furans Oxides of Nitrogen
Total Mercury  Total Organic Carbon (TOC)
Ammonia Volatile organic carbon (VOC)
Halogens & Halides  Oxygen
Hydrogen Chloride Pressure, temperature and velocity.

Our instruments and procedures are compliant with British Standards and MCERTs requirements. UKAS Accreditation has been achieved for our use of the latest Fourier Transfer Infra-Red (FTIR) analysers enabling on site gas analysis to be carried out more efficiently and cost effectively.

Standards applicable to the monitoring of various substances are listed below:



Particulate Matter
BS EN 13284-1
Gas velocity, pressure and temperature
BS EN ISO 16911
Sulphur Dioxide
BS EN 14791
Nitrogen Oxides
BS EN 14792
Carbon Monoxide
BS 15058
Carbon Dioxide
BS ISO 12039


BS EN 14789
Volatile Organic Compounds
BS EN 12619
Hydrogen Fluoride
BS ISO 15713
Hydrogen Chlorides
BS EN 1911
BS EN 14790
Dioxins, Furans and PCBs (Dioxin like)
BS EN 1948

Total Mercury

BS EN 13211

Polycyclic Aromatic Hydrocarbons (PAHs)

BS ISO 11338
BS EN 14385
Fourier Transform Infrared (FTIR) Spectroscopy