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India, pollution

In this March 4,2016 photo, An indian police oofficial wearing pollution mask, controls the traffic during rush hour.India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China. In India, the air pollution is due to vehicle traffic including cargo trucks running on low-grade diesel, individual fires that residents burn in winter, crop being burnt by farmers in neighboring states, and construction site dust. Burning coal in power plants is also major contributor that is expected to increase hugely in the coming decades to match electricity needs of the ever-growing city and its booming satellite towns, according to a report. (Photo by Ritesh Shukla/NurPhoto)

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