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A sales associate prepares aromatic oxygen flasks at the "Oxy Pure" bar in New Delhi, Nov. 22, 2019. An outlet in the highly polluted capital city sells residents a lease of what it claims "pure oxygen". (Xinhua/Javed Dar)

A sales associate prepares aromatic oxygen flasks at the "Oxy Pure" bar in New Delhi, Nov. 22, 2019. An outlet in the highly polluted capital city sells residents a lease of what it claims "pure oxygen". (Xinhua/Javed Dar)