OF THE PROPOSED BASE TRANSCEIVER STATION (BTS)
The sources of ambient air pollution, especially in urban environments, are often quite diverse. These sources can be broadly classified as stationary, mobile and area emission sources. Emissions of pollution from these three classes of sources typically result in complex spatial and temporal distributions of ambient air pollution concentrations. Emission inventories form a cornerstone for planning a monitoring strategy.
This section of the Environmental Impact Assessment of Etisalat Base Trans-receiver Station (BTS) examined the baseline condition of the project area and to evaluate the likely air quality impacts associated with all the different phases of the Project.
The study was carried out at the two (2) Etisalat proposed base stations B3467 and B5169 located in Osun State. Figure 1 shows the map of Osun state indicating the L.G.A where the proposed project locations are located in Osun State.
Free via SkypeFigure 1: Map of Osun State showing the Local Govt. Area where the Proposed Project Locations is Located
This assessment involves the measurement of air quality data (such as Ammonia (NH3), Hydrogen Sulphide (H2S), Carbon Monoxide (CO), Suspended Particulate Matter (SPM), Volatile Organic Carbon (VOC); micro climatic data and noise level measurement at strategic locations within the proposed project area.
Fieldwork took place on Monday 1st to Wednesday 3rd October 2012 taking into consideration design plan of four sampling locations strategically located within and around each of the proposed site. Table 1 shows the description of the sampling locations with their coordinates.
Table1: Sampling Locations for the Proposed BTS Site in Osun State S/No| Station ID | Coordinates| Sample Location|
| | Latitude| Longitude| |
1.| B3467| 07.79690° N| 004.58615° E| BTS Site| | | 07.79705° N| 004.58595° E| Upwind|
| | 07.79661° N| 004.58630° E| Downwind|
| | 07.79736° N| 004.58552° E| Control|
2.| B5169| 07.54581° N| 004.40165° E| BTS Site| | | 07.54525° N| 004.40151° E| Upwind|
| | 07.54601° N| 004.40187° E| Downwind|
| | 07.54485° N| 004.40139° E| Control|
2.0Sampling Strategy and Methodology
The study entails qualifying pollutant behaviour in both space and time. A good network design was adopted to optimize both spatial and temporal coverage within the constraints of available resources. Here, continuously operating automatic analysers were used to assess the baseline information and compared with the regulatory guidelines.
The pollutants addressed are ammonia (NH3), carbon monoxide (CO), hydrogen sulphide (H2S), Nitrogen oxide (NO), nitrogen dioxide (NO2), sulphur dioxide (SO2), and volatile organic compounds (VOCs), Particulates: PM1, PM2.5, PM10, and TSP. The noise level at each locations and the climate/meteorological parameters such as wind speed, wind direction, ambient air temperature and relative humidity were also assessed. Plates 1 and 2 below shows the pictures of the air quality equipments and the demonstration of use.
Plate 1: Picture of Air Quality Equipments used for this Study
Plate 2: Picture of Demonstration of Use of the Air Quality Equipments
The rationale for selecting these species is that they are:
* Ubiquitous in air
* Widely recognized as posing a potential risk to population health * Commonly regulated at a national or international level.
A consistent, harmonized approach has been adopted in considering the individual components. For each of the pollutants, the following issues are considered: * Health effects, which provide a rationale for assessment (why the study is carried out); * Sources and exposure patterns, which suggest where to monitor; * Monitoring methods, which indicate how to monitor using available...