In 2011, the Centre for Science and Environment (CSE) conducted a decibel survey which showed that Delhi had some of the noisiest roads in India. A new study by a hearing test app, Mimi, too, confirms CSE’s findings. According to the study, which analysed data of 200,000 people in 50 cities across the world—including Delhi and Mumbai—worst noise pollution was reported in Delhi. More so, citizens of Delhi had the maximum amount of hearing loss proportionate to their age. Noise pollution in cities is directly linked to 64 per cent of hearing loss, said the study. Zurich, Vienna, Oslo, Munich and Stockholm were ranked lowest in terms of hearing loss and noise pollution, according to the study done by the hearing test app. While Guangzhou in China reported the highest incidence of noise pollution, Delhi came second. The results were calculated on the basis of noise pollution data from the hearing app—which tests participants’ hearing on the basis of their age and gender— the World Hea...