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"An eight-year-old girl becomes China's 'youngest' lung-cancer patient as doctors say high levels of air pollution responsible for her condition"

"Eastern China's dangerous levels of air pollution blamed on coal burning, car exhaust, factories and weather patterns"

"China's cabinet has outlined measures aimed at improving the country's air pollution problems, which have plagued many of its larger cities over recent years. One of the main measures, announced in state media over the weekend, is a target to reduce emissions from heavily polluting industries by 30% by the end of 2017. In statement after a meeting chaired by Premier Li Keqiang, the State Council said there would be "tough measures for tough tasks""

"The WHO last week named India's capital the worst of 1,600 cities for PM2.5 particles. What are the other measures of pollution, and do the experts agree?"

"With the highest levels of nitrogen dioxide of any capital city in Europe, London's air pollution from traffic is linked to strokes, heart and respiratory diseases as well as some cancers and asthma. Enter a postcode to see how polluted your road is"

Thanks largely to vehicle emissions, Mexico City was once the world's most polluted urban centre. But over the past decade, a focus on sustainable alternative transport has persuaded a growing number of citizens to leave their cars at home. A heavily subsidised underground network caters for 22m journeys daily, and conditions on the city's overcrowded roads have improved, with the metro bus system and the introduction of public bicycles contributing significantly to reduced pollution levels

"A three-year review into the future of air travel around London is due to finish with the recommendation that a new runway be built at one of two existing airports. But while the capital gingerly edges towards airport expansion, other parts of the world are witnessing a massive airport building boom."

"Over 40 million tonnes of electric and electronic waste (also known as e-waste) are produced worldwide every year. That is boundless heaps of refrigerators, computers, television sets, ovens, telephones, air conditioning units, lamps, toasters and other electric and electronic devices, with a total weight equal to seven times that of the Great Pyramid of Giza. "

"The gardens are home to one of a growing number of azoteas verdes - or green roofs - that are springing up around Mexico City as part of the metropolis's efforts to purge its air of the pollution that has long been among its least-desired claims to fame."