Read the latest updates on Expo 2020 Dubai
The Vice President and Ruler of Dubai visited the Expo 2020 command centre, where he was briefed on preparations for the event.
The operations centre is the base for more than 100 units, consisting of both government and private entities, responsible for operations, safety and security.
Sheikh Mohammed used Twitter to praise the effort that has been put into organising the world's fair.
In an update posted in Arabic, he said that "134 teams of 95 nationalities are working as one global team to launch a leading global event in a country that brought the world together at one time and in one place".
He wrote: "The most beautiful event will be a milestone in the history of Expo."
Sheikh Mohammed reviewed Dubai Health Authority's Expo emergency centre, which will offer healthcare services to visitors, including PCR tests.
The DHA's five-lane drive-through PCR testing facility and screening centre has a capacity of 10,000 tests a day, which will provide results within four hours.
The eagerly anticipated world's fair will open to the public on Friday, October 1.
The first expo to be staged in the Middle East will be an international celebration of culture and innovation featuring 192 nations.
Preparations are gathering pace, with the extravaganza only days away.