The NIMBY Phenomenon: When Proximity Transforms the Relationship with Urban Space
The Sustainability Directory portal, in one of its publications[1], suggests that the proper management of the so-called Not In My… syndrome
In dense urban areas, especially near city centers, noise pollution has become a recurring and worrying element for public health. This constant noise can come from various sources, such as motor vehicle traffic, industrial activities, construction, and the daily movement of people. This reality shows that noise, unfortunately, has become part of the urban soundscape, but understanding its causes and control mechanisms is essential to mitigating it.
Urban configuration plays an important role in sound propagation. Cities with unplanned growth often have narrow streets with heavy traffic, buildings constructed with little setback, and proximity between residential areas and industrial sectors. These conditions favor proximity between noise sources and receivers, increasing negative impacts on the population. Therefore, conscious and preventive urban planning emerges as a priority measure to promote quality of life.
Technological advancements have also contributed to mitigating the problem. Industrial equipment and vehicles with lower noise emissions have been developed and, when combined with effective public policies, become tools for environmental control. Brazilian legislation, for example, offers important regulatory instruments. The National Environmental Policy (Law No. 6,938/1981) recognizes noise as a pollutant; Law No. 9,605/1998 (Environmental Crimes Law) criminalizes the emission of noise harmful to health; and the Brazilian Traffic Code (Law No. 9,503/1997) establishes parameters for the control of vehicular noise, regulated through CONAMA.
Therefore, ensuring urban modernization combined with public health requires integrated actions in planning, innovation, and regulation, aimed at controlling and reducing noise pollution levels in cities.
In urban areas where excessive noise directly affects sensitive areas such as hospitals, schools, and residential zones, it becomes necessary to adopt noise control measures. One of the most effective strategies involves acoustic insulation, both in buildings and in the immediate surroundings.
At the building level, insulation is achieved through the use of appropriate construction materials, thicker exterior walls, sealed windows and doors, and an architectural layout designed to attenuate sound entry. This approach allows buildings to adapt to their surrounding sound environment. However, when noise is intense or affects several buildings collectively, the use of acoustic barriers becomes necessary.
Acoustic barriers work effectively by preventing the direct, reflected, or diffracted propagation of sound. They are designed to block the direct line between the sound source and the receivers, absorb some of the sound energy reflected off surfaces such as the ground, and contain sound diffraction at their upper and lateral boundaries.
Despite their effectiveness, the implementation of these barriers requires careful planning. In many cases, streets with medium-sized trees already contribute to shade, ventilation, and air purification, but are not sufficient for noise control due to the empty spaces between the tree canopies. In locations with little space between roads and buildings, the installation of physical barriers can hinder mobility and visual permeability, requiring solutions integrated into the building itself.
Therefore, acoustic barriers represent an important tool in controlling urban noise pollution. However, it is crucial to understand that mitigating noise at the source remains the most effective strategy, especially in consolidated areas where structural adaptation is more complex. The combination of preventive measures, architectural solutions, and public policies for environmental control constitutes the most promising path towards healthier and quieter cities.
