Abu Dhabi: A number of countries participating in Dubai Expo 2020 will begin working on their pavilions starting April this year. Speaking to Emirates News Agency (WAM), Najeeb Al Ali, Executive Director of the Dubai Expo 2020 Bureau, said that more than 180 countries will be participating in Dubai Expo 2020, some of which will build their own pavilions, while others will rent. He pointed out that Expo 2020 is expected to attract 25 million visitors, 150,000 visitors a day.