Table 4 Air quality concentration during the dry season
From: Environmental impact of quarrying on air quality in Ebonyi state, Nigeria
Location | Sulphur dioxide (µg/m3) | Chlorine (µg/m3) | Volatile organic compound (µg/m3) | Ammonia (µg/m3) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | |
Ishiagu | 44.50 | 53.10 | 42.80 | 22.10 | 30.21 | 23.01 | 20.20 | 27.63 | 19.30 | 49.70 | 63.12 | 53.43 |
Umuoghara | 43.10 | 51.99 | 41.60 | 23.15 | 31.01 | 24.33 | 21.21 | 30.04 | 20.50 | 50.05 | 65.21 | 52.01 |
Ngbo | 45.01 | 58.30 | 44.00 | 21.47 | 31.25 | 24.20 | 23.42 | 33.06 | 22.90 | 53.80 | 66.32 | 54.30 |
Control | 3.01 | 5.00 | 2.90 | 6.01 | 6.20 | 6.01 | 5.90 | 6.00 | 4.89 | 10.03 | 11.12 | 10.45 |
Mean | 33.91 | 42.09 | 32.83 | 19.39 | 24.66 | 19.39 | 17.68 | 24.18 | 16.89 | 40.89 | 51.44 | 42.55 |
S. Error | 2.00 | 3.23 | 2.80 | 1.26 | 2.01 | 2.80 | 0.02 | 0.03 | 0.01 | 0.04 | 0.01 | 0.03 |
F-LSD (p < 0.05) | 4.35 | 3.80 | 4.12 | 4.11 | 5.20 | 5.31 | 3.10 | 3.25 | 4.01 | 2.21 | 2.36 | 3.00 |
WHO (2021) | 100 | 10 | 20 | 1000 | ||||||||