What factors contribute to the pollution of Delhi, Mumbai, and Kolkata as listed by Switzerland

The main reasons behind the inclusion of Delhi, Mumbai, and Kolkata in Switzerland's list of most polluted cities are as follows: 1. Industrial activities: All three cities are major industrial hubs, with numerous manufacturing units and factories. The emissions from these industries contribute significantly to air pollution. 2. Vehicular emissions: The increasing number of vehicles on the roads of Delhi, Mumbai, and Kolkata leads to a high level of air pollution. The emissions from cars, buses, and trucks contribute greatly to the pollution levels in these cities. 3. Construction activities: Rapid urbanization and infrastructural development lead to construction activities, which result in dust and debris. These particulate matters add to the pollution levels. 4. Waste management: Improper waste management practices, including open burning of garbage, contribute to pollution. These cities generate a huge amount of waste, and the inefficient disposal methods result in air and water pollution. 5. Geographical factors: Delhi, Mumbai, and Kolkata are all coastal cities, which can lead to stagnant air, trapping pollutants and making it difficult for them to disperse. Overall, the combination of industrial emissions, vehicular pollution, construction activities, inefficient waste management, and geographical factors contribute to the pollution levels of Delhi, Mumbai, and Kolkata.