East state in Nigeria, has been labelled the world’s most polluted city followed by Peshawar in Pakistan.
The particulate matter(PM) measured to get this result are 2.5 and 10 microns in diameter, roughly 30 times smaller than the width of a human hair.
According to the WHO, an air quality monitor there registered 594 micrograms per cubic metre of microscopic PM10 particles, and 66 of the more deadly PM2.5s. Onitsha’s figures are nearly twice as bad as notoriously polluted cities such as Kabul, Beijing and Tehran.It is said to be 30 times more than the WHO’s recommended levels of PM10 particles
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