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Two apprentices who work on the Queen Elizabeth Olympic Park and were on hand for members of the media to interview, wait by the windows of a viewing gallery in the Orbit sculpture as London's Canary Wharf business district and other parts of the capital stand shrouded in smog in the background during an Olympic Park tour organized for the media, Wednesday, April 2, 2014. British authorities have warned people with heart or lung conditions to avoid exertion as a combination of industrial pollution and Sahara dust blankets the country in smog. The environment department said Wednesday's air pollution level could reach the top rung on its 10-point scale. (Photo by Matt Dunham/AP Photo)
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