A woman uses her smartphone before the Chanel Cruise Collection 2015/16 fashion show at the Dongdaemun Design Plaza in Seoul, May 4, 2015. (Photo by Thomas Peter/Reuters)
Participants wearing masks during a hazy day at the Beijing International Marathon in front of Tiananmen Square, in Beijing, October 19, 2014. (Photo by Reuters/Stringer)
A Virgin Atlantic passenger plane flies in the sky with the moon seen in the background, in London, Britain January 19, 2016. (Photo by Toby Melville/Reuters)