Table 5 Air quality concentration during the dry season
From: Environmental impact of quarrying on air quality in Ebonyi state, Nigeria
Location | Hydrogen cyanide | Noise | ||||
|---|---|---|---|---|---|---|
Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | |
Ishiagu | 43.77 | 65.13 | 45.21 | 39.89 | 50.57 | 41.01 |
Umuoghara | 46.40 | 66.01 | 47.02 | 40.01 | 52.30 | 42.77 |
Ngbo | 43.10 | 62.66 | 44.20 | 38.99 | 53.60 | 40.33 |
Control | 5.18 | 5.40 | 5.20 | 09.10 | 10.11 | 09.23 |
Mean | 34.61 | 49.80 | 35.41 | 31.99 | 41.65 | 33.34 |
S. Error | 0.01 | 0.01 | 0.02 | 0.03 | 0.01 | 0.03 |
F-LSD (p < 0.05) | 0.02 | 0.03 | 0.02 | 0.03 | 0.03 | 0.04 |
WHO (2021) | 0.01 | 90 | ||||