Air at two Dhaka slums 5 times thicker than usual Plan International reveals findings of Buet, ICCCAD study Staff Correspondent Staff Correspondent Air density at two of Dhaka's most marginalised low-income slums is four to five times higher than the permissible limit in Bangladesh for a 24-hour period. As a result, residents suffer from air pollution-induced diseases like laryngeal problems, asthma and bronchial illnesses. A study report published yesterday titled "Urban Localised Pollution in the Context of Climate Change" revealed this information at a virtual launching event. According to the report, the major sources of indoor air pollution in both marginalised areas are earthen stoves for cooking and using biomass as fuel. Women are the most severely affected by air pollution, as they are exposed to smoke for long stretches of time during cooking.