Community response to noise around Noi Bai International Airport from 2009 to 2018

Noi Bai International Airport (HNBIA) is the second largest airport in Vietnam. Recently, the rapid development of air transport in Vietnam, together with the urbanization of the area around the airport, resulted in increased levels and wider influential scale of noise due to the airport operation. This study summarizes the results of socio-acoustic surveys on community response to noise conducted around NBIA from 2009 to 2018. The number of flights operated at NBIA and the population density at residential areas around the airport has increased significantly in the past nine years. The exposure noise levels (Lden) at surveyed sites ranged between 48 and 61 dB in 2009, but increased to range between 54 and 76 dB in 2017. Exposure-response relationships established in the five surveys conducted from 2014 to 2018 were found to be higher than that established in 2009 survey. Especially, an excess response due to the step-change of noise exposure was found when the airport operation changed after the opening of the new terminal at the end of 2014. This effect seems to decline over time but responses remain high when compared to that of the steady state at the same noise exposure level.