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Tourists visit the Kowloon promenade along Victoria Harbour that faces the Hong Kong skyline on a polluted day on September 27, 2016. Nine out of 10 people globally are breathing poor quality air, the World Health Organization said on September 27, calling for dramatic action against pollution that is blamed for more than six million deaths a year. / AFP / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

Tourists visit the Kowloon promenade along Victoria Harbour that faces the Hong Kong skyline on a polluted day on September 27, 2016. Nine out of 10 people globally are breathing poor quality air, the World Health Organization said on September 27, calling for dramatic action against pollution that is blamed for more than six million deaths a year. / AFP / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
Getty Images

AFP ANTHONY WALLACE