POLLUTION// Delhi may be the worst city in India when it comes to air pollution but Mumbai is the noisiest. The latest report of the Central Pollution Control Board (CPCB) took into account noise from vehicles, generator sets, office machines, aircraft, industrial and construction activities when coming up with the list of India’s noisiest cities. According to a report in The Times of India, Mumbai breached the safe noise levels — 55 decibels during the morning and 45 dcibels during the night — consistently between 2011 and 2014. Although Delhi has the highest number of vehicles in India, the city has a lot of greenery especially along main roads and this may have helped it stay at No 4 after Mumbai, Lucknow and Hyderabad. Noise pollution is a serious problem in India and the CPCB report pointed out how noise pollution could lead to more stress (tension), unhappiness, loss of hearing and sleep disturbance.