ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Air pollution. Aerial photograph of Canary Wharf, London, UK. The haze visible over the horizon is photochemical smog, a type of air pollution that results from the action of sunlight on hydrocarbons in the lower atmosphere. This business complex contains the UK's three tallest buildings. These are (from left to right), the Citigroup Centre, 1 Canada Square and the HSBC Tower.
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