Millions of Muslims undertake Hajj in Mecca amid extreme heat and safety measures.

Millions of Muslims are undertaking the Hajj pilgrimage in Mecca, facing challenges due to extreme heat and a ban on children under 12. Last year, over 1,300 died in a heatwave. Saudi authorities are deploying cooling units, expanding shaded areas, and using AI to manage crowds. The Hajj, a religious obligation for Muslims, costs between $4,000 and $20,000, with some countries offering flexible payment plans to make it more accessible.