article_snippet: Most cities in China, such as Beijing and Shanghai (pictured), face serious air pollution issues .
article_snippet: : China burns a large amount of petroleum and coal, two major causes of pollution .
article_snippet: China's cities are often hit by heavy pollution – in the form of smog
article_snippet: – caused by burning a large amount of petroleum and coal.
article_snippet: Self-protection: A girl puts a mask on A girl dog in Shijiazhuang, capital of north China's Hebei Province, during a smog attack .
article_snippet: Fake sunrise: An LED screen on the Tiananmen Square shows what a sun-rise looks like in heavily polluted Beijing .