A new study has found that cities with the most noise pollution also have higher rates of hearing loss, suggesting that urban noise and hearing loss are linked. Fifty large cities were ranked based on their noise level and rate of hearing loss and it was found that high-decibel areas like New Delhi, Cairo, and Istanbul had the highest rate of hearing degradation. In comparison, cities that were rated lower on the noise level scale like Vienna, Oslo, and Munich were found to have lower rates of hearing loss.
While these results suggest that there is a connection between city noise and hearing loss, researchers assert that it does not mean that noise pollution is the main force that causes hearing degradation. Henrik Matthies, the managing director of Mimi Hearing Technologies referred to these results as “robust” and stated: “The fact that noise pollution and hearing loss have such a tight correlation points to an intricate relationship.”
The connection was found by comparing data from two databases. The first database used information from the World Health Organization and a technology research group based in Norway called SINTEF in order to create a noise pollution ranking scale for cities worldwide. The second contained hearing loss data gathered by Mimi though their cellphone-based hearing test. In comparing the data, it was found that individuals who lived in the loudest cities were on average ten years older in terms of their hearing ability.