Urban noise is not merely an everyday nuisance. At European level it is treated as an environmental and public health issue. Directive 2002/49/EC on the assessment and management of environmental noise establishes a common framework for identifying, preventing and reducing the harmful effects of exposure to noise, particularly in large urban areas and in areas affected by road, rail or air traffic.
In this context, investment in electric public transport is becoming essential. M6 Metro Line, which will provide a direct link between Gara de Nord and Henri Coandă – Otopeni International Airport, is one such project: an underground infrastructure with a direct impact on mobility and the potential to reduce surface traffic congestion along the capital’s northern corridor.
European data show that the issue of noise is not an abstract one. According to the European Environment Agency report Environmental noise in Europe 2025, long-term exposure to traffic noise is associated with significant effects on health and quality of life. The report estimates that, across Europe, this contributes annually to numerous health problems, including cardiovascular diseases and sleep disorders, as well as to significant economic costs. Furthermore, millions of Europeans are affected by severe sleep disturbances caused by traffic noise, and the economic impact of transport-related noise pollution is estimated at over 100 billion euros annually. The World Health Organisation has also drawn attention to this issue. The WHO Environmental Noise Guidelines for the European Region, published in 2018, recommend a limit of 53 dB Lden for road traffic, which is stricter than the European threshold of 55 dB. The reason is simple: constant exposure to noise can affect sleep, cardiovascular health and, ultimately, quality of life.
For Bucharest and the Otopeni area, the implications are concrete. According to the technical and economic indicators approved by Government Decision 930/2016, M6 Metro Line will have a maximum transport capacity of 50,000 passengers per hour, in each direction. This capacity can absorb a significant flow of passengers who currently use road transport, thereby helping to reduce the number of cars on the DN1 and on the adjacent roads.
The more cars there are in traffic, the higher the noise level. Conversely, every journey shifted from the car to electric public transport means less pressure on the city. M6 Metro Line serves two purposes: it provides an underground service, with no surface noise, along the route from Gara de Nord to Otopeni Airport, and it helps to reduce road traffic on one of the busiest transport corridors in the Bucharest area.
The benefits will be felt both by residents of the areas along the alignment and by those who continue to use the DN1. Smoother traffic implicitly means less noise from engines, braking, acceleration and horns.
Quiet is rarely the first argument when we talk about infrastructure. More often, we discuss speed, capacity, connectivity or safety. But in the case of M6 Metro Line, acoustic comfort becomes part of the wider change the project brings to the city: mobility that is more efficient, cleaner and friendlier to people.
Sources: EEA – Environmental noise in Europe 2025 | WHO – Environmental Noise Guidelines for the European Region 2018 | Directive 2002/49/EC | GD 930/2016 – Technical and economic indicators, M6 Metro Line
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