Table 8 Air quality concentration during the rainy season
From: Environmental impact of quarrying on air quality in Ebonyi state, Nigeria
Location | Hydrogen cyanide (μg/m3) | Noise dB(A) | ||||
|---|---|---|---|---|---|---|
Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | Morning (6am) | Afternoon (12:00 pm) | Evening (6.00 pm) | |
Ishiagu | 42.13 | 63.00 | 44.60 | 37.01 | 48.20 | 39.56 |
Umuoghara | 45.12 | 65.11 | 46.24 | 38.22 | 50.11 | 40.14 |
Ngbo | 41.52 | 60.01 | 42.09 | 36.01 | 50.42 | 38.67 |
Control | 5.00 | 5.26 | 5.09 | 09.00 | 10.00 | 09.12 |
Mean | 33.44 | 48.35 | 34.51 | 30.06 | 39.68 | 31.87 |
S. Error | 0.02 | 0.02 | 0.01 | 0.01 | 0.01 | 0.02 |
F-LSD (p < 0.05) | 0.01 | 0.02 | 0.01 | 0.02 | 0.02 | 0.03 |
WHO (2021) | 0.01 | 90 | ||||