IN PHOTOS: Devotees perform rituals and mark the start of the four-day Chhath Puja festival

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Devotees take a holy dip in the Ganga river during the start of the 4-day Chhath Puja festival, in Patna.

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Other regional names include Chhath, Chhathi, Chhath Parv, Dala Puja, and Dala Chhath

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Devotees take dip in Ganga river during the start of the 4-day Chhath Puja festival, in Patna

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Women offer prayers while taking a dip in the Ganga river during the first day of 'Nahay Khay' ritual

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BJP MP Ravi Shankar Prasad with others distributes puja materials to women in Patna

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Chhath Puja is dedicated to the Sun God, Surya Dev, and is celebrated to promote the well-being, prosperity, and progress of one’s family

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Devotees carry the holy water of River Ganga after performing the rituals of 'Nahay Khay'

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The worship of Surya Dev spans four days and includes a ritual called ‘Arghya,’ performed while standing in knee-deep water

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A devotee performs rituals on the bank of the Yamuna river as toxic foam floats on the surface of the polluted river at Kalindi Kunj in New Delhi

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Despite efforts from Delhi Jal board to combat toxic foams in Yamuna, they remain to be a health hazard for devotees