The WHO Air Quality Guidelines serve as global standards to assess and manage air pollution. They cover major harmful pollutants such as fine particulate matter (PM2.5 and PM10), nitrogen dioxide (NO₂), ozone (O₃), sulphur dioxide (SO₂), and carbon monoxide (CO). …
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Clean air is important for human health, so buildings are ventilated, bringing in “clean” outside air for humans to breathe, expelling the polluted indoor air to the outside. But outside air is not always clean, and ventilation can worsen the …
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