Led by Swedish arms expert Ake Sellstrom, the investigations into the alleged use of chemical weapons will be limited to three areas, including a March attack on the Aleppo suburb of Khan al-Assal.
UN Secretary General Ban Ki-moon had said on Tuesday that the expert team would conduct its activities in the country for up to 14 days and that it could be extended upon mutual consent, as agreed with the Syrian government.
Ban also urged full access for the expert team to the sites where the chemical weapon attacks allegedly happened.
"Let me state again clearly that, if confirmed, the use of chemical weapons by any side under any circumstances must be held accountable and would constitute an international crime," he said.
Some 635 people were reportedly killed in the alleged chemical attack staged by the Assad regime on the suburbs of eastern Ghouta, near Damascus.
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