Noise index contours and dose-response relationships
Recently, in other countries, many researchers investigate the dose-response relationships between the amount of noise exposure and the adverse noise effects. Notably, it is said that the increase of late and early flight at the airport, caused by extended hours of operation due to relocating the airports offshore, makes it difficult to estimate effects of aircraft noise by using only existing noise indices. Therefore, from now on, we think it becomes more necessary to study and get to know local residents response to aircraft noise, in our country.
In 2004 and 2005, a social survey on adverse effects of aircraft noise around Narita International airport were conducted by the local government of Narita city and Kyoto University.
This survey was focused on the following elements; annoyance, disturbances of daily life (hearing interference, sleeping disturbance) and quality of life. As a result, the value of the Environmental Quality Standards for Aircraft Noise were suggested based on the relationships between various noise indices
(WECPNL, Lden, LAmax, the number of noise events) and those adverse effects. We assisted Narita city and Kyoto University with their investigation by supporting
the analysis of measurement of aircraft noise, estimating noise contours based on measurements, working behind them regarding
the survey. We assisted in them from the planning to the implementation phase, data analysis and support to their academic publication.