Purpose: Unsustainable actions have resulted in the deterioration of the environment. Higher education institutions are social entities responsible for developing future leaders who have the skills and abilities to solve societal challenges. This study aims to develop a conceptual assessment model of environmental sustainability in higher education and apply the model to test the environmental sustainability level of a higher education institution. Design/methodology/approach: The fuzzy logic method is used to develop the conceptual model, and a higher education institution in India was selected for evaluating the environmental sustainability level. Findings: The fuzzy environmental sustainability index for the higher education institution selected for the study was computed as (3.58, 4.95, 6.33). The computed value identifies the institution as "environmentally sustainable". The calculation of the fuzzy performance importance index further helped in identifying weak attributes that need improvement. Research limitations/implications: The result of this study would help the management understand their current environmental sustainability level and take corrective measures to improve the weak attributes. It would also assist the institution in reworking its processes and practices. Originality/value: This study has contributed to the literature of environmental sustainability assessment by creating a conceptual model for evaluating environmental sustainability in higher education. This model can be applied to any higher education institution.