Environmental Impact Assessment

Environmental Impact Assessment (EIA) is a decision-support process that identifies and evaluates the likely environmental effects of a proposed project before approval. It integrates environmental concerns into project planning through impact prediction, public participation, mitigation measures and an Environmental Management Plan, enabling informed approval, modification or rejection.

Legal and institutional framework in India

The Environment (Protection) Act, 1986 and the EIA Notification, 2006 provide the principal framework for prior environmental clearance of projects listed in the notification's Schedule.

• Category A projects are appraised at the Union level by the Ministry of Environment, Forest and Climate Change with the assistance of an Expert Appraisal Committee.
• Category B projects are considered by the State Environment Impact Assessment Authority, assisted by a State Expert Appraisal Committee, subject to the notification's classification rules.

How assessment precedes approval

The process generates evidence on environmental risks and places it before the regulatory authority. Depending on the project category, it involves screening, scoping, public consultation and appraisal.

• Baseline studies establish existing environmental conditions and help predict impacts on air, water, land, biodiversity and affected communities.
• Assessment of alternatives can identify a less damaging site, technology, design or operating method.
• Public consultation records the concerns of locally affected people and other stakeholders with a plausible stake in the project's environmental consequences.
• Appraisal examines the EIA report, consultation outcomes and proposed safeguards before recommending approval, conditions, redesign or rejection.

Role in environmental governance

EIA applies the precautionary approach by examining foreseeable harm before potentially irreversible investments are made. It does not automatically prohibit development; it improves the environmental quality and accountability of project decisions.

• Mitigation measures and the Environmental Management Plan translate predicted impacts into enforceable clearance conditions and monitoring commitments.
• For projects affecting shared rivers, coasts, airsheds or habitats, assessment can reveal cumulative and cross-border impacts, supporting consultation and cooperation between neighbouring states.
• Its effectiveness depends on reliable baseline data, independent appraisal, meaningful participation, transparent decisions and post-clearance compliance.