Each year, millions of Muslims from across the world embark on the Hajj pilgrimage to Mecca in Saudi Arabia. The mass migration is unparalleled in scale, and pilgrims face numerous health hazards.
Mecca is considered the holiest city for Muslims. And Hajj is one of the Five Pillars of Islam, making it a mandatory religious duty for Muslims to perform at least once in their lifetime if they are physically and financially capable.
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