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Internal environmental quality
Interior environment quality inspection verification

Internal environmental quality

Minimising risks for people caused by indoor air quality

The objective of the Standard UNE 171330-2 is to verify that interior environment quality inspections and their results comply with certain procedures and quality requirements. For this verification the organisation is required to carry out an initial assessment of the environmental situation inside the facility to be inspected and implement any measures needed to fulfil the requirements established in the standard.

The Standard UNE 171330-3 establishes the policy, responsibilities of Management, the resources and the guidelines for implementation, operation, measurements, analyses and improvement, and includes the requirements that interior environment quality management systems must meet, in a similar way to other management areas among organisations.

Benefits for the organisation and users:

  • Ensuring the comfort and well-being of employees and other users of the buildings.
  • Minimising the risk of adverse events (sick building syndrome, lipoatrophy, legionella, etc.).
  • Improvement in the working atmosphere.
  • Increased productivity and a reduction in absenteeism.
  • Improvement in the quality of the maintenance of facilities.​


The standards UNE 171330-2 and UNE 171330-3 have a general scope and apply to the indoor air quality of all types of enclosures, facilities and buildings, except for those used for industrial and farming activities.

The indoor air quality management system in accordance with the standard UNE 171330-3 is based on the PDCA (Plan-Do-Check-Act) ongoing improvement cycle. This standard has been designed in a similar way to other standards such as ISO 14001 or ISO 9001, and therefore is a complementary tool that is compatible and can be integrated with other management systems.

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For the standard UNE 171330-2, once the process has been successfully completed, the organisation obtains the AENOR Certificate of Verification for the Inspection of Indoor Air Quality.

For the standard UNE 171330-3, once the process has been successfully completed, the organisation obtains the AENOR Management Systems Certificate for Indoor Air Quality.

AENOR Mark on Interior Environment Management

AENOR Mark for
Indoor Air Quality

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The headquarters of Unión Fenosa in Madrid was the first building to which AENOR granted its Environmental and Interiors Quality Inspection Certificate in 2009. Many facilities have been verified since then, such as the Endesa facilities and those of the Tax Agency in Madrid. Furthermore, certificates are being awarded to many different organisations for Interior Environment Quality Management.