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Campaigners today rounded on Boris Johnson's mayoral strategy for cleaning up London's air, claiming that the measures to tackle a key public health issue are not "fit for purpose".

Johnson has been under pressure to produce a credible package of measures to tackle London's poor air quality, which sees an estimated 4,267 Londoners dying prematurely each year because of long-term exposure to airborne pollution, according to figures released by city hall this year.

Johnson's third and final version of his air quality strategy, published today, outlines a number of measures – most for improving London's air quality, which is the worst in the UK and among the worst among European cities.

london air quality Boris Johnson public health

After wrestling for years with Beijing's appalling traffic and pollution problems, city planners have come up with a distinctly old-fashioned solution: bicycles.

beijing china cycling bicycles pollution air quality

Mexico's Energy Ministry has announced that the nation is undertaking a series of measures to clean up its air--and its air could certainly use it. Mexico City is one of the most polluted in the world, and 21 million cars, many of them heavy polluters, crowd Mexico's streets. And 14 million more are expected in the next seven years

mexico air quality auto emissions

Climate change will so dramatically impact Earth's atmosphere that there could be a 20-per-cent increase in the amount of harmful ultraviolet radiation hitting some parts of the planet, scientists are warning.

uv radiation climate camp GreenNumbers greenmonktv air quality

Air pollution is one of the number one factors that affect our quality of life and health. Currently, pollutants are measured at different stations in a city and that data is aggregated to a single number (the air quality index) and published once a day on a website. There is not enough data that gets gathered to evaluate air quality in a given neighborhood and that data is hard to find. Now a European company called Sensaris is using Bluetooth wireless sensors, used in combination with mobile phones, that allow citizens to monitor and report air and sound quality data. Its first large scale deployment is in Paris.

greenmonktv air quality pollution air pollution sensaris

Hong Wei was born with an extra thumb on his right hand. His elder sister Lixia, who's 14, was born with a twisted left foot and walks with a heavy limp.

Like many people in Shanxi, this family is too poor to go to the doctors. The parents don't know why their children were born with defects. They're simply left to guess.

"The air isn't good around here," says Li San San. "When it's bad, it's difficult to breathe, it looks gloomy and smoggy out there."

china pollution air quality greenmonktv