Research Article
Air Quality and Human Health Risk Assessment in the Residential Areas at the Proximity of the Nkolfoulou Landfill in Yaoundé Metropolis, Cameroon
Table 5
WHO ambient air quality standards.
| Pollutant | Averaging duration | Maximum allowable limit | Reference |
| PM2.5 | 24 hours | 25 μg/m3 | [6] | Annual | 10 μg/m3 | [6] | PM10 | 24 hours | 50 μg/m3 | [6] | Annual | 20 μg/m3 | [6] | CO | 15 minutes | 100 mg/m3 | [5] | 30 minutes | 60 mg/m3 | [5] | 1 hour | 30 mg/m3 | [5] | 8 hours | 10 mg/m3 | [5] | SO2 | 10 minutes | 500 µg/m3 | [6] | 24 hours | 20 μg/m3 | [6] | CH2O | 30 minutes | 0.1 mg/m3 | [5] | H2S | 24 hours | 150 μg/m3 | [5] | O3 | 8 hours | 100 μg/m3 | [6] | NO2 | 1 hour | 200 μg/m3 | [5] | Annual | 40 μg/m3 | [5] |
|
|