| Pollutants | Nigeria (FMEV) | National Air Quality Standard for Nigeria | WHO Guidelines and World Bank Standards | |
| Long-Term Tolerance Limits 24 Hours (mg/m3) | Short-Term Tolerance Limits 30 min (mg/m3) | |||
| Suspended particulate matter | 0.015 | 0.5 | 250 mg/m3 (24 h) 600 mg/m3 (1 h) | 60 - 90 mg/m3 (annual mean) 150 - 230 mg/m3 (24 h) |
| Carbon dioxide | 10 vol. % | - |
| - |
| Carbon monoxide | 1.0 | 0.5 | 10 mg/m3 (1 h) 20 mg/m3 (8 h) | 60 mg/m3 (24 h), 10 mg/m3 (8 h), 30 mg/m3 (1 h) |
| Nitrogen dioxide | 0.085 | 0.085 | 75 - 113 mg/m3 (24 h) | 40 - 50 mg/m3 (annual), 150 (8 h), 200 mg/m3 (24 h) |
| Sulphur dioxide | 0.05 | 0.5 | 0.01 (24 h) 0.1 (1 h) | 50 mg/m3 annual, 350 mg/m3 (1 h), 125 mg/m3 (24 h) |
| Benzene | 0.8 | 0.2 | - | 1 mg/ m3 |
| Toluene | 0.6 | 0.6 | - | 1 mg/m3 (odour) 7.5mg/m3 |
| Ethylene | 5.0 | 5.0 | - | - |
| Xylene | - | 0.2 | - | - |
| Hydrocarbon (total) | 2.0 | 5.0 | 160 mg/m3 (3 h) | 160 mg/m3 |
| Cadmium | 0.003 | 0.01 | - | 10 - 10 mg/m3, 0.04 mg/m3 |
| Chromium | 0.001 | 0.0015 | - | 1 mg/ m3 |
| Lead | 0.005 | 0.002 | - | 0.5 - 1 mg/m3 (annual) |
| Manganese | 0.01 | 0.03 | - | 1 mg/m3 (annual) |
| Vanadium | 0.002 | - | - | 1 mg/m3 (24 h) |