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With the growth of urban areas, the areas adjacent to airports are becoming densely inhabited, causing a big problem known as encroachment. The encroachment occurs when a significant portion of the population is submitted to the adverse effects of noise, even outside the areas of restricted use established by the airport zoning. The metric used for the airport zoning in many countries and in Brazil is the DNL (Day Night Level). This metric is associated to the average sound energy produced by all aeronautical events during a period of 24 hours, with weighting of 10 dB(A) during the night. However, the use of DNL for airport zoning can lead to different results for noise levels, daytime and nighttime, depending on the seasonality of airport activity in those periods. The paper proposes a study of alternatives for the airport zoning based on the Brazilian Standard ABNT/NBR 10151.

The objective of this paper is to present a method of determination of airport noise levels and environment noise using computer simulation, thus reducing the need for physical measurements in the areas affected by airport noise. Through the simulations, the hourly airport noise was characterized for a wide range of critical receivers. Levels for airport and environment noise had been calculated, considering that environment noise is generated mostly by the flow of motor vehicles on the nearby roads. From the results of these simulations it was possible to choose points where continuous noise measurements are made. Using the simulated values, we hope to determine a safe and precise way of predicting the noise generated from airports throughout the country minimizing the needs of conducting physical measurements to obtain the noise curves.