The Sindh Environmental Protection Agency is launching a study on Thursday to measure noise levels at various city spots, it has been learnt. According to sources, the study, second in more than a decade and a half, will be carried out at different places at different times so that the level of noise pollution could be recorded. The sources said longer exposure to a high level of noise affected human health, causing a loss of hearing, stress, etc, which in turn lowered the level of tolerance in people owing to which they tended to lose temper at the slightest of provocation. The earlier such study by Sepa was conducted in the mid-1990s. Tibet Centre on M. A. Jinnah Road