1. Where a piece of measurement equipment within the continuous emissions monitoring system is out of operation for more than five consecutive days in any calendar year, the operator shall inform the competent authority without undue delay and propose adequate measures to improve the quality of the continuous emissions monitoring system affected.

The measurement-based methodology should be set on a more equal footing with the calculation-based methodology in order to recognise the increased confidence in continuous emissions monitoring systems and underpinning quality assurance.

For specific periods of unabated emissions of NO from adipic acid, caprolactam, glyoxal and glyoxylic acid production, including unabated emissions from venting for safety reasons and when abatement plant fails, and where continuous emissions monitoring of NO is technically not feasible, the operator shall subject to the approval of the specific methodology by the competent authority calculate NO emissions using a mass balance methodology. For this purpose the overall uncertainty shall be similar to the result of applying the tier requirements of Article 41(1) and (2).

Minimum content of monitoring plans for aviation emissions

Provision shall be made, at regular intervals not exceeding 24 months, to ensure that the environmental verifier continues to comply with the accreditation requirements and to monitor the quality of the verifications undertaken.

Major investments were carried out during the 1996-99 period, the main objective being to increase water supply capacity and improve quality in the Greater Lisbon, Greater Oporto and Algarve regions, to monitor underground water quality, and to renovate and build new waste-water treatment plants in the main towns and more sensitive areas.