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Table 2 Limit concentration of each air pollutant according to the WHO and to the Lebanese Ministry of Environment

From: Association between exposure to ambient air pollution and occurrence of inflammatory acne in the adult population

Outdoor air pollutants

WHO guidelines [12]

Lebanese Ministry of Environment averages [29]

NO2

40 μg/m3 annual mean

200 μg/m3 1-h mean

100 μg/m3 annual mean

150 μg/m3 24-h mean

200 μg/m3 1-h mean

SO2

20 μg/m3 24-h mean

500 μg/m3 10-min mean

80 μg/m3 annual mean

120 μg/m3 24-h mean

350 μg/m3 1-h mean

CO

10 mg/m3 8-h mean

30 mg/m3 1-h mean

10,000 μg/m3 8-h mean

30,000 μg/m3 1-h mean

O3

100 μg/m3 8-h mean

100 μg/m3 8-h mean

150 μg/m3 1-h mean

PM2.5

10 μg/m3 annual mean

25 μg/m3 24-h mean

PM10

20 μg/m3 annual mean

50 μg/m3 24-h mean

80 μg/m3 24-h mean