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put this to the test using a hand-held detector to test for airborne particles known as PM10. They found that the city’s air failed to meet the WHO’s air quality guidelines for PM10 on six out of seven days. These particles are caused by traffic, construction work and factory emissions and are responsible for much of this city’s pollution. On one of these days, the pollution reading was seven times over the WHO’s air quality guideline. By comparison, recent readings done in London, which …