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The World Health Organization guidelines were most recently updated in 2021. The guidelines offer guidance about these air pollutants: particulate matter (PM), ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2) and carbon monoxide (CO). The WHO first released the air quality guidelines in 1987, then updated them in 1997. The reports provide guidelines intending to give guidelines to reduce the health effects of air pollution.

The guidelines stipulate that PM<sub id="mwGQ">2.5</sub> should not exceed 5 μg/m3 annual mean, or 15 μg/m3 24-hour mean; and that PM<sub id="mwHQ">10</sub> should not exceed 15 μg/m3 annual mean, or 45 μg/m3 24-hour mean. For ozone (O3), the guidelines suggest values no higher than 100 μg/m3 for an 8-hour mean and 60 μg/m3 peak season mean. For nitrogen dioxide (NO2), the guidelines set 10 μg/m3 for the annual mean or 25 μg/m3 for a 24-hours mean. For sulfur dioxide (SO2), the guidelines stipulate concentrations not exceeding 40 μg/m3 24-hour mean. For carbon monoxide concentrations not exceeding 4 mg/m3 24-hour mean.

Dangane da tasirin kiwon lafiya, jagorar ta bayyana cewa PM2.5 maida hankali na 10 shine mafi ƙasƙanci wanda aka nuna jimlar, mutuwar zuciya da huhu da ciwon daji na huhu sun karu da fiye da 95% amincewa don mayar da martani ga bayyanar PM2.5 na dogon lokaci.

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