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 |