What were the reasons for pollution in Calcutta?
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According to data released in 2009 by the Scientific and Environmental Research Institute, atmospheric suspended particulate matter (SPM) in Kolkata was 511. This made Kolkata the most polluted metropolitan city in India, followed respectively by Mumbai, Delhi and Chennai. In a 6-years long study completed in 2007, the Chittaranjan National Cancer Institute (CNCI) found that 70% of residents of Kolkata suffer from respiratory diseases, like lung cancer, dyspnea and asthma, caused by air pollution. According to the CNCI study, 18.4 cases of lung cancer per 100,000 people were reported from Kolkata.
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