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Small Rare Earth Ore Dryer In Ghana

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May 24 2020nbsp018332Ghanas annual mean concentrations of PM 25 far exceed the WHO guidelines by as much as three times 311 micrograms per cubic meter gm3 of ultrafine particles of 25 micrometers or less in diameter which are known to pose a threat to health as they can clog human lungs The WHO recommended annual guideline for PM 25 is 10 gm3