Monitoring of industrial emissions is required in order to demonstrate conformity to legislation, such as the European Directive on industrial emissions (Directive 2010/75/EU).
NPL provides gas standards for calibrating a wide variety of analysers for measuring stack and other industrial emissions gases. Binary and multi-component gas mixtures can be prepared to the requirements of the customer. The table below gives an indication of the available mixtures; others may be available on request.
| Component | Matrix gas | Amount fraction range | |
| From | To | ||
| Carbon monoxide | Nitrogen or air | 1 μmol/mol | 750 mmol/mol |
| Carbon dioxide | Nitrogen or air | 1 μmol/mol | 750 mmol/mol |
| Oxygen | Nitrogen | 1 μmol/mol | 750 mmol/mol |
| Nitrogen monoxide | Nitrogen | 1 μmol/mol | 10 mmol/mol |
| Nitrogen dioxide | Nitrogen | 1 μmol/mol | 5 mmol/mol |
| Ammonia | Nitrogen | 10 μmol/mol | 1 mmol/mol |
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