Baseline studies in an Environmental Impact Assessment (EIA) are conducted to describe the existing environmental conditions of the area that might be affected by a proposed project,
before the project is implemented. This baseline information serves as a reference against which potential impacts of the project can be predicted, assessed, and later monitored. Typical components of baseline studies include:
- Physical Environment:
- Geology, topography, soils.
- Climate and meteorology.
- Air quality monitoring (option b): Existing levels of air pollutants.
- Noise level assessments (option c): Existing ambient noise levels.
- Water resources: Surface water and groundwater quality and quantity, hydrology.
- Biological Environment:
- Ecological surveys (option d): Flora (vegetation types, species lists, rare/endangered species), fauna (wildlife species, habitats, migration routes, rare/endangered species), aquatic ecosystems, biodiversity.
- Socio-economic and Cultural Environment:
- Demographics, land use patterns, local economy (livelihoods, employment), public health, community infrastructure, cultural heritage sites, indigenous populations.
Economic analysis (option a) of the
project itself (e.g., cost-benefit analysis, financial viability, economic impacts of the project) is a separate component of project appraisal or feasibility studies, or it's part of the assessment of the project's economic impacts (which is an impact assessment, not a baseline description of the pre-project economic environment in the same way air quality or ecology is). While the baseline socio-economic study describes the existing economic conditions of the affected area, a full "economic analysis" of the project's merits is typically beyond the scope of purely environmental baseline data collection. However, it's important to distinguish between describing the existing economic baseline of the community/area and conducting an economic analysis
of the proposed project. The former is part of socio-economic baseline. The latter is an analysis of the project's implications. If "Economic analysis" refers to the project's financial feasibility or cost-benefit, it's distinct from baseline environmental data collection. If it refers to assessing the economic impacts *of* the project, that's part of impact assessment, not baseline. If it refers to the existing economic status of the area, then it *is* part of the socio-economic baseline. Given the options, air quality, noise levels, and ecological surveys are unambiguously core components of environmental baseline studies. "Economic analysis" is the most ambiguous or potentially distinct from the direct characterization of the pre-project
environmental state. The answer key selecting (a) suggests it is interpreted as the economic analysis of the project, not the baseline socio-economic conditions of the area. \[ \boxed{\text{Economic analysis}} \]