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The city also suffers from water pollution as the sewer system tends to fail and overflow. On occasion, sewage has escaped onto the streets to create a health hazard. This problem is hoped to be solved by a new sewer system funded by the European Union, which could cope with the demand of the city. The dangerously high levels of mercury in the city's water system has global health officials concerned over related health risks. There is also more concern about environmental issues among Egyptians than before. There is now general awareness and some projects are laid down to help make the public aware of the importance of a clean environment.

International relations

Twin towns — Sister cities

Cairo is twinned with:

North America

* Houston, United States (1998) * New York City, United States (1982) * Ottawa, Ontario, Canada (1989)

Asia

Beijing, People's Republic of China>China (1990) * Seoul, South Korea (1997) Tokyo, Japan (1990) Xi'an, People's Republic of China>China (1997)

Europe

* Barcelona, Spain (1992) * Frankfurt, Germany (1979) * Istanbul, Turkey (1988) Minsk, Belarus (1998) * Paris, France (1985) * Stuttgart, Germany (1979)

Famous people born in Cairo (Cairenes)

  • Abu Sa'id al-Afif - 15th century Samaritian
  • Boutros Boutros-Ghali, former Secretary-General of the United Nations
  • Naguib Mahfouz, novelist, Nobel Prize in Literature in 1988.
  • Mohamed ElBaradei, former Director General of the International Atomic Energy Agency, 2005 Nobel Peace Prize laureate.
  • Dalida Italian-Egyptian singer who lived most of her life in France She received 55 golden records and was the first singer to receive a diamond disc.
  • Yasser Arafat (1929-2004), Founder and first president of the Palestine Liberation Organization
  • Sir Magdi Yacoub (1935), world-famous cardiothoracic surgeon
  • Dorothy Hodgkin, British chemist, credited with the development of protein crystallography, Nobel Prize in Chemistry 1969
  • Naguib Sawiris, 62nd richest person on earth in 2007 list of billionaires, reaching US$10.0 billion with his company Orascom Telecom Holding
  • Sam Mounir, writer, actor, and director
  • Sherif Sonbol (1956), chief photographer of the Cairo Opera House and Al Ahram Weekly, book author, first Egyptian photographer whose work has been subject of an exhibit at New York´s Lincoln Center
  • Constantin Xenakis (1931) Greek artist
  • Ekmeleddin İhsanoğlu Turkish professor and the secretary general of the Organisation of Islamic Cooperation
  • Voula Zouboulaki (1931) Greek actress
  • Raffi Cavoukian, Canadian children's singer, born 1948
  • Mido, Professional football player with AFC Ajax
  • Umar al-Tilmisani, The third General Guide (Murshid al-'Am) of the Egyptian Muslim Brothers
  • Alaa Abdelnaby- NBA player for the Portland Trail Blazers, Milwaukee Bucks, Boston Celtics, Philadelphia 76ers, and the Sacramento Kings
  • Nora Valsami, Greek actress, in 1945
  • Maryem Tollar, Egyptian singer who primarily sings Arabic songs.
  • Yakup Kadri Karaosmanoğlu, Turkish novelist
  • Sonja Zuckerman, socialite and philanthropist known for her charitable contribution to women's shelter and homeless organization, net worth of $1 billion.
  • Kosta Argeres, who emigrated to Australia in 1956 and became a well-regarded soccer player before becoming a successful property developer and owner.
  • See also