For the last three weeks, residents of Beijing have been breathing thick, soupy air so choked with pollutants that it has registered far off the scale of acceptable levels. Yet places like Beijing or New Delhi, India, which has also had extremely unhealthy air quality levels, are far from the only cities to be plagued. Air pollution affects practically everyone on the planet and causes more than 6 million premature deaths every year, according to the World Health Organization. Yet, this insidious and
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