India, Aug. 21 -- Residents in many parts of Delhi woke up to an azure sky, an unusual sight in one of the most polluted capitals in the world.

A similar natural phenomenon was also noticed by many Delhi residents on August 6, when the sky was unusually blue.

Meteorologists have attributed to Delhi's unusual blue sky to a raft of factors, albeit what, they said, could be a short-lived affair.

The blue sky would be a temporary natural phenomenon because easterly winds have started blowing and low-pressure area is lying over eastern Madhya Pradesh and Chhattisgarh and that would lead to overcast conditions over the north-western parts of the country as well, according to meteorologists.

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