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Houston is one of the most polluted cities in America.
BBC: Climate chaos: Transcript
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The fact that Romania has an average January temperature in the mid-20s, the lowest per capita income in the European Union and is the home to both Dracula and Copsa Mica, one of the most polluted cities in the world, never entered into my thinking.
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This followed a 1998 study by the World Health Organization that found that seven of the ten most polluted cities in the world were Chinese.
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The report found that 22 of the 25 most ozone-polluted cities improved their air quality in the past year.
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The organization's recent State of the Air 2012 report found that California is home to many of the country's most polluted cities, with Los Angeles continuing to top the list of ozone-polluted cities thanks to its heavy road traffic and trade ports.
CNN: Smog-eating tiles gobble up air pollution
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China has five of the world's 10 most polluted cities, and on an average day in China's major cities, 75 percent of the residents are breathing unclean air.
CNN: Economic miracle, environmental disaster
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The World Bank has said China has 16 of the world's 20 most polluted cities.
NPR: Some Economies Suffer As Beijing Cleans Up Air
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According to environmental monitoring group the Worldwatch Institute, China now boasts 16 of the world's 20 most polluted cities.
CNN: China: Economic growth, environmental destruction
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The World Bank last year listed Guangzhou, the capital of China's fastest growing province, Guangdong, and seven other Chinese cities among the 10 most polluted in the world.
CNN: China's industrial growth fuels major pollution problems
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Most cities that topped the ALA's most polluted lists for particle and ozone pollution have seen their levels decrease.
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