Aircraft noise pollution has been monitored around Milano-Linate airport since early 80s. Accomplishing EU principle "the polluter pays", Italian law in 1995 assigned to airport handling companies the responsability of noise monitoring systems, operating costs and manteinance. The Lombardia airport system consists of three main airports: Milano Malpensa (international hub), Milano Linate (international and city airport), Bergamo Orio al Serio (international and cargo). About 23% of the whole Italian traffic involves this airport system (about 26 million of passengers and 400 kT of freight). Despite of the committment in this activity (several Remote Monitoring Terminals (RMT) are installed around Malpensa, 5 around Linate and 5 around Orio al Serio) communities living around airports demand the presence of a neutral authority auditing the process from noise measurement, managed by handling companies, to environmental impact assessment, carried out by a special Committee collecting members from each Airport Authority. This audit activity can cut off some prejudices, connected with the handling company role, which has the responsibility of monitoring its customers (i.e. aircraft companies) and can achieve a major certainty about noise assessment. Regional Environmental Protection Agency (ARPA) acts as auditor: this is one of its insitutional tasks assigned by Italian legislation. Its aim is asserting the validity of measurement in order to achieve a good significance about noise indexes. ARPA elaborated a standard procedure for accomplishing this role, in analogy with the Quality Assurance approach. This standard procedure includes two steps: the first one concerns the collection of information by means of a questionnaire given to the airport monitoring system conductor; thereafter, an auditor team performs a complete inspection with the support of a checklist, providing also measurements close to remote monitoring terminals using a reference instrumentation. The checklist includes 16 steps, for a total of 128 items concerning the monitoring system, intended as a whole, and 58 items about remote monitoring terminals (RMT), which are controlled one by one. The checklist follows a logical track, starting from measures, following with data processing and concluding with impact assessment. Each item in the checklist is splitted into seven sections: legislation reference, answer to question, conformance, control flag, test description, annexes, presence of comment-if needed, a specific comment is included in the checklist related report. This structure has the capability to perform a complete survey on the whole system. The control of each monitoring system is periodical, and is carried out throught a minimum of two surveys per year. In the paper we present a brief outline of italian law about noise and we discuss in detail the checklist, its scope and pratical operating procedure.
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